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Working With Plastics

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Some people are not very familiar working with plastics. So we will continuously be adding useful info about plastics, here are few first ones we put together: Joining and Gluing ABS Painting parts with molded-in colors - a great partnership. Your Guide To ABS Drop us a note if you find this info useful. If you have more questions/topics you'd like us to cover in future posts, please respond to this thread or submit suggestion on our website using this form

Clausing 1771 Drill Press Restoration

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I picked up a Clausing variable speed drill press from a Craigslist ad. I offered the guy $200.00 and he accepted. The drill press was in decent overall condition, and had a new motor on it. I disassembled the machine and cleaned up and painted everything. Mechanically, it was in very good condition, and the only real repair work I did was to straighten a few of the handle arms. One really nice feature is the table lift, which works great on that heavy table (btw: the table doesn't have a single drill mark in it!) This is my second Clausing variable speed drill press. The first one is in my metal shop, this one will be in my wood shop. Jack Fort Loramie, Ohio
Rebuilding the head on a South Bend 4219 1956 mill
VN Finally Got A Slotter Attachment
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Finally picked up a slotter attachment that I have been looking for. Probably paid a bit much, but it's practically new. Stripped it and cleaned out the old gunk. Back together already, quickest rebuild yet. Missing one oil cap and the arbor, but I have a print for the arbor. All I did was clean it. Jason

Working With Plastics

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Some people are not very familiar working with plastics. So we will continuously be adding useful info about plastics, here are few first ones we put together: Joining and Gluing ABS Painting parts with molded-in colors - a great partnership. Your Guide To ABS Drop us a note if you find this info useful. If you have more questions/topics you'd like us to cover in future posts, please respond to this thread or submit suggestion on our website using this form

Unique Chess Set

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Just when you thought "what else can be done with the chess set", a new idea comes along... This is what a chess set using Plasti-Block™ ABS dual color rods could look like. Other color combinations can also be fun! Let us know what else would you like to see modeled using this product. We are looking forward to hear your ideas. Plasti-Block™ Team
Unique Two-Layered Chess Set.

A Nice Gear Tutorial #1

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I'm going to make some gears soon and came across this while brushing-up and refreshing my memory. Of course, the Machinist's Handbook has it all but, this is a very nicely authored and to-the-point tutorial. This is based on Diametral Pitch and not the Module method. I have some other guides based on Module method but need to check the copyright information. Enjoy... Ray

Making Frank's Cranks

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Finally got around to taking some photos of my process as I make some of my string winding cranks. Here's one with a koa handle: These cranks feature a soft head made of low density polyethylene, an angle of 83-degrees to simulate wrist rotation, and a solid bearing in the handle. Interestingly, one of the first questions I get about them is, "How do you achieve that angle?" So, I'll start the description with that in mind. . . The only commercially made part is the little brass ball, which I drill almost all the way through with a 6.4mm drill that gives me a .252: hole, making for a nice sliding fit for a 1/4" precision ground aluminum rod: Here, I'm using my tiny Rusnok milling machine. I have the ball set into a matching cavity I milled by plunging with sa 1/2" ball end mill into the steel soft jaws on my old 4" Kurt vise. By the way, I get my soft jaws for vises and chucks from monsterjaws.com - no affiliation - they sell CNC made jaws for about what I'd pay for raw...
Making a couple of threaded spindle backing plates for my lathe
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When I sold my Atlas 10F24, I held on to my Bison 5” 3J, as it was fairly new. Naturally I needed to make a new backing plate to mount it onto the new lathe. The old plate was 1 1/2” X 8 while the new spindle is 2 1/4” X 8, so I needed new metal to do this. I recently purchased 2 backing plates from Busy Bee Tools. They are 8” semi raw castings. They are turned to clean off the rough cast surface and the center hole is 1” ID unthreaded. First I started by reading up on what could be the rights and wrongs in making these backing plates. Recent posting here by various people, too many to list, have been of excellent help. I make a copy of my spindle, so that I had a plug to try the threads as they neared finish size. I used the 3 wire method to make the plug match the spindle. Once the readings were the same between the two, I was finished. I did stamp the diameter and tpi for future reference. I am making two backing plates. One for the above Bison chuck and the second for...

Phase converter vs VFD

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I know these questions come up but I need some input. So far I have the Bridgeport mill on a VFD. Now I need to power the lathe and the surface grinder. The question is to keep going VFD or to buy a rotary phase converter. Literature says I need a 15hp VFD for a 7.5hp lathe. I was hoping to get a 10hp RPC and use the existing 40amp circuit its on. If I go RPC, I need to pull another wire and it would be worth it to run a 3phase panel and distribute power. OR I can just buy 2 more VFD's. Total price for VFD's (Im running 2 chinese ones now) its about $500. The RPC is $900 (10hp...$1300 15hp) and need a panel and misc electrical supplies. If I run VFD's, I can skip the new power pull, panel, etc. I actually may be able to get away with a single VFD for both the lathe and the surface grinder because they are both 7.5hp units. Any input?

how to cut a taper thread

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What is the process for cutting a taper thread? I am guessing I would need to use my taper attachment.

fusion 360 or solid works

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I have no formal training and everything I have learned about machining has come from members here, you tube, and trial and error. With that being said, which program would you recommend someone like me? I have never used any type of design software but it would be nice to print out a set of prints vs drawing them.

Question for you tool lovers

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If you had to start over, to replace your equipment and power/hand tools. How much money would it take? I need to come up with a budget. Excluding the lathe and mill, I think at least $25,000 for hand and power tools and another $7,500 for lathe/milling accessories. New lathe and mill, $18,000. Welding and plasma, $6,500 What say you?
How-To Videos
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We post at least 1 short video a week, help us with topics that you might like us to cover on YouTube channel. Plastics are more flexible than metals or wood How to Square a Plastic Block Machining plastics - long and strong chips of material How to clamp a plastic block into a vise

Enco 13X40 Cracked Top Slide Way

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There is a crack in back of the top slide and the way is bent. Should I try and braze this back together? The rest of the lathe is in pretty good condition. Sharpie line to show crack.

The Plasti-Block YouTube Channel Is Now Live!

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The Plasti-Block YouTube Channel Is Now Live! Following a number of inquiries about our plastics including what type to choose and how to use them, we decided it would be beneficial to create an information hub from which we can share our knowledge and experience with you. We have chosen to start a YouTube channel as videos are an excellent way to show, in detail, the many aspects of machining plastics that you may not have previously known or considered. While text and pictures have their own advantages, videos allow you to focus on the nuances in a way that these other forms cannot accurately convey. Our YouTube channel is aimed at everyone. We uploaded first 4 very short and very basic videos. The plan is to create videos from how-to and tutorials to safety and best practices. We aim to add video content to our channel on a weekly basis. I really hope that you’d be interested to give us a feedback/suggestions/provocations for topics about machining plastic, as it is vital in...

L-W Dividing Head Change Gears

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I recently bought a L-W Dividing Head. It came with three dividing plates and a tail stock. It was missing the auxiliary shaft assembly and the change gears. My question is, does anyone know what the pitch and pressure angle of the change gears are? I would like try to make a set of change gears. I found a single change gear for a L-W on Ebay but the description of the tooth count and the outside diameter works out roughly to 11 dp? This doesn't sound quite right to me. mhooper
Calculating a circle segment?
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Forgive me if parts of this do not make sense, as I am not sure how to even ask what I want. I wish to learn how to calculate partial circles cut into an object. Example: If I have a round knob already, and I want to cut in shallow radii around the circumference, like above, I need to be able to calculate the width of the circle for a given depth of that circle, or once I know the width I want to cut, what diameter cutter will I need to use to get that width while the depth is less than the radius. In the pic, the radii are very shallow, and definitely not half of the diameter of the circle that radius would be part of. Yes, I realize the pictured knob is not cut, but cast in that shape. I am thinking that once I have the circumference measurement of my knob, I then would split it into sections, like above, there would be 6 notches and peaks. I want wanted all of them to be equal width, with a circumference of 3.141 (for a 2" diameter knob), I would divide by 12, which gives me...

Measuring and grinding a V block for a suburban master grind

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I purchased a suburban master grind awhile back and unfortunately it didn't come with the v block assembly. I ended up purchasing the v block from suburban and it states when buying that finally fitment is necessary. Okay so I mounted a pin gauge in the V block and did some measuring. Of course every measurement I take has like .0002 variance. I am pretty new to this but from my understanding this thing needs to be perfectly centered within the master grind or whatever you grind will be off. My questions are am I measuring this the correct way. The V block needs the sides ground only so that's it's centered in the groove of the face of the master grind. The height of block is adjusted by slots on block. Here's my setup for measuring. Tenths indicator pin lightly clamped in V and taking measurements from the sides. My problem is the first picture I have .0003 difference from left to right,how do I know if pin is placed correctly in V. I've read that the hold down is touchy when...

Too Many Chips in the Scroll when Boring

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When using a boring bar, the chips are pushed into the bore. I’m curious what you do to keep chips out of the scroll on a 3 jaw. I just cleaned it, now I have to do it again. (On the other site someone would say, “don’t use a 3 jaw”) Ball of foil stuffed into the bore? I appreciate your ideas. Jeff

New 3 1/2" jaws?

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I bought a vise with no maker mark and it was missing jaws. It is 3 1/2" and the mounting holes are 2 1/4" on center. Can't seem to find anything online. I guess I could make some but wouldn't I want to have them hardened? Anyone know if a source for pre-made jaws?

Tap and Clearance Drill Sizes-Clarification Needed

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Hi gang, I am acquiring quality drill bits for general use but mostly to fabricate and repair low carbon steel, cast iron and aluminum. I have a drawer full of bits but, I recently purchased a good set of fractional Rushmore drill bits (short-the name eludes me). I also buy quality tap and threading dies. My next purchase is to fill in the gaps for lettered and numbered bits. Example, to drill a 1/4" hole, there are 6 possible drill bits required; For 75% Thread in Aluminum, Brass and Plastics>> 1/4 x 20 .1887 =#7 1/4 x 28 .2062 =#3 1/4 x 32 .2117 = 7/32 For 50% Thread in Steel, Stainless and Iron>> 1/4 x 20 =7/32 (.2188) 1/4 x 28 .2280 =#1 1/4 x 32 .2280 =#1 For Close Fit, Drill size .2570=F For Free Fit, Drill Size .2660 =H It makes no sense to buy cheap because the drilled hole will not be round, it's anyone's guess what size you end up with. This leads me to my confusion. Do I really need to follow the printed guides? Is there a rule of thumb from you experienced...

Repurposed slip wrench

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If anyone on here has ever owned / maintained an in-board engine boat you may have, used, and or seen one of these adjustable slip / lock nut wrench. They are "used" to adjust the packing nuts on the engine shaft... note "used" in quotes... they generally do not work, especially on older saltwater boats, and most folks generally resort to using pipe wrenches etc.. i have personally seen one these come flying out of the bilge accompanied by a stream of expletives as it landed in the bayou,, Anyways i bought one for my first in-board boat several years ago and since i never throw tools away, regardless of how useless i still have it. Turns out it makes a fairly decent adjustable pin wrench... it really is pretty easy, i just drilled and tapped the jaws out for a couple 12-24 screws and now this tool actually functions... rich

Tread mill motor

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After seeing what can be done with treadmill motors I’ve been on the hunt for one , I found a free one on CL and here it is. I don’t think it’s reversible as the brushes are at a slight angle. The flywheel fan didn’t want to come off , I found one of the resistors legs on the card broken , should be able to solder it back together. I guess my question is what will I have to get to make it work for ?? A belt sander ?. Thanks for any / all advice

Proper shielding of iGaging DRO USB cables and installing stainless steel flexable conduit

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I just purchased and received 20 feet of stainless steel flexible conduit to use on my iGaging DRO USB bables. Its 7MM OD and 5MM ID. I figured the solid conduit was better than the automotive grade plastic split conduit since it doesn’t protect the wires from cutting fluid and chips very well. I need to run the cables through the conduit so I am going to have to cut off one of the ends and then refasten it to the cable. I also figured, while I’m at it I might as well make sure that the cables are properly shielded. My question is, to properly shield the cable I need to make sure that one end of the shielding is connected to the ground and the other is not? Do I have that right? And which end should be connected to the ground? Any recommendations on which end of the cable to cut off for inserting it throught the conduit. If anyone is curious as to where I got the conduit, here is a link. It was only $30 and it is made very well...

Rohm Supra Drill Chuck needs a new arbor

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I bought the Jacob's arbor removal tools, 3 different sizes. Either too big or too small. If you aren't familiar with a Rohm, made in Germany, keyless drill chuck, they are very close to an Albrecht. I have seen videos where they drilled and pinned the old arbor to make a stop for a pipe to allow the wedges to work. I got this pic online. Mine is in better shape, same idea though. Any other ideas?

Cutting down QCTP tool holders

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We've touched on this subject. The BXA QCTP I bought for my Grizzly G0773 lathe / mill combo (12 x 27 swing & c - c) doesn't sit low enough on my cross slide. I couldn't begin to mill the holders as they are too hard. So it was suggested that I mount 1 up in the 4 jaw & starting from the center, cut it to size. OK, got it chucked up. What insert or cutter should I use?

Milling t slot nuts that I bought

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Issue #1: I goofed and order t slot nuts for my Shars x-y table with a 5/8" threaded hole instead of for a 5/8" slot. They are case hardened. Can they be milled or do I just order the correct ones? Issue #2: I also ordered nuts for my P&W 3C mill and they fit pretty darn well except just a hair too tall, so I need to mill them too. The nuts are Shars and it doesn't say what type of steel.
Any Variable Speed Drive Experts Out There?
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I am in the process of restoring an old Powermatic E-16 wood planer. I have run into a problem disassembling the Mills drive. I am hoping someone has done this before or has some diagrams, pictures, etc. I have removed everything I could, but the shaft has a boss on it, so all the remaining parts have to come off in the other direction. As you can see from the pictures, there are two ears that need to be removed to get the pulleys off. The ears are separate and independent of each other. They move a little bit, but I can't pull them out. I would prefer not to damage anything, but I am running out of alternatives. Evidently, there is some sort of retainer that I don't see. Anybody know how to get this thing apart? Thanks Randy

Another VFD Question -Fluxmaster 50

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I have been struggling with this VFD from day one. When I went to see this Bridgeport before I purchased it the VFD gave the same error codes. For the record, It's the original GE 1HP, 3 phase, step pulley motor. I am getting an intermittent stoppage during use with an error code OCA. Every time I toggle off the Drum Switch I get an "OCA" code. I reset and it may start up or it may give me another OCA code, another reset and it works fine, until the next power cycle. I have checked the amp readings on the 3 legs to the 1hp motor, 2.87, 2.97 and 3.04. That's good right? I have checked the HP range of the VFD, I have checked the wiring and the ground. I am fairly confident the motor is good. This is how I have it set up= Accel time 5 seconds F01 Decel time 5 seconds F02 F03 factory F04 rotation Hertz 60hz "04" F05 Hertz upper limit 75 F06 Hertz lower limit 30 F07 SP1 Frequency 10hz -factory setting F08 JOG frequency 6hz. F09 F10 keypad F11 keypad-terminal Carrier frequency 5 F12...

rossetta stone?

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This is on my 1916 Southbend Lathe any idea of what it is decoding? I am really hoping it somehow is telling me what gears to use and their position to let me cut threads. now that I have all of these

Dividing Heads

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3 Dividing Heads & 3 tailstocks. They are L to R & B to F: Van Norman 10", Brown & Sharpe 10", Van Norman 7 1/2". The B&S is the most widely copied dividing head ever. Copies started showing up as soon as the patent ran out in the early 20th century & are still being made. So, that was my 1st choice. My mill is a Van Norman, though. So when a couple of that brand came along at good prices, I couldn't resist. That 210 pound behemoth on the left is gonna stay put for a while.

Chrome-Moly-Nickel steel

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Hello I need to remove about 8 thou from the diameter of some 7/8" rods of the above material. What is the best way of going about it on a lathe please? The current finish on the rods is impressively smooth. Needle rollers will be running on the reduced diameter surface, so I need to get an appropriate finish. Regards Doug

Resettable overload (fuse) and marring workpieces

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I have a Grizzly 7x12 lathe that uses a 4amp fuse. I've had to replace it twice already. I'm looking for a way to have a "resettable" replacement for the fuse so I don't have to worry about it. I know good work practice eliminates the issue, but I still want to do it anyway. Also, any suggestions on preventing workpiece damage when using the chuck? I keep marring the workpiece when I tighten up the chuck to secure it.

Car engine flywheel spacer any experience?

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I'm in the beginning stages of a car project, and i'm doubting, should i keep the insufition factory petrol engine, or do a diesel swap, the only complication is there are no factory bolt on gearboxes for those engines, so people are making adapters to fit them but also a flywheel spacer is needed, and i've never had to make one before, so i wanted to ask has anyone made one, what to look for , what material to make it from, also can i make strong enough bolts, because factory one are way too short, this is a picture i found of someone had made exacly for aplication like i need.

An Order of Operation Question

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I'm making a spring clip for my dividing head. It holds tension on the sector arms that rest against the indexing plate. I have the ID dialed in on a rotary table below my mill head. Here's the question: Would you remove the part & form the bevel before or after the side is cut away?

We Are Making Progress

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I have been a member of this forum for several months now. Looking back, watching and reading the threads, many of us are making progress. Maybe I should read more and post less. Based on my earlier posts, questions, observations, I probably should have kept my mouth shut. Have you seen Tom Lipton's, Youtube video when he makes all 6 sides of a cube square? My version is not a perfect square but all six sides have 90 degree angles. I verified it with the equipment I have available. Using what I have learned, setting up each cut with a fly cutter, I achieved a goal. My old Bridgeport pulled it off. Now if I can just attach the pics.

Cobalt blanks? Other questions.

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I just ordered some 3/8" cobalt blanks for my lathe. Any experiences with them? I've been using 1/4" HSS and it the cutting edge dulls out quick, so I'm going to try out cobalt. Maybe the fact that it's 1/4" had something to do with it, so I ordered some 5/16" HSS blanks, too. Maybe larger blanks don't dull out as much. Also, any tips on prolonging carbide inserts for cutting tools? I chip them pretty quick. Besides taking smaller cuts, what other steps should I do/avoid in order to prolong these inserts?

What are my options for chuck replacement?

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I have a Grizzly 7x12 lathe that I bought a few months ago. It came with a 3 jaw chuck. I want a chuck that can grip larger diameter work pieces. I guess I can just bore out the work piece and grip it from the inside with the internal jaws the chuck came with, but I just want to get a chuck that can open up considerably more. Do I have options or am I stuck with this one? Also, a quick question about 4 jaw independent chucks. People keep recommending them, but wouldn't it be a pain to have to find the center every time you put a work piece in, compared to a 3 jaw chuck that automatically centers the work piece?

Fall Hershey purchases

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2 Armstrong machinist jack's $10 45 assorted reamers $50 3-1/2" vise $60 1/2" cutoff blade $8 3/8" square end t handle wrench for my lathe chuck $1 Wire and metal gauge "gauge" $5 Chunk of random metal - free sitting by trash can when guys were packing up

CNC'd Harbor frieght 8x14 linear rail upgrade...and maybe more??

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So I've had a harbor freight 8 x14 lathe for a while, and I cnc'd it a while back, but after converting my mill to linear rails it had to happen to the lathe too. so this is what I'm starting with And while a lot of work has already been done, such as ballscrews and spindle motor upgrades, there is so much more that can be done and this upgrade is a great excuse to do it. So I don't know where this build thread will take me yet, but ignorance is bliss at the moment. So on with the destruction! First step, strip it all down to the little bits. Next up I have to mill the saddle rib off the bed. There's no place for that where we are going. But of course it's not as easy as just slapping it on the mill and going at it with some scrap carbide. Of course there's a whole bunch of gunk on the bottom of the feet. I bought the lathe used and I think the previous owner had glued around the mounting holes for some reason. A little elbow grease later and both pads are clean as a whistle...

Collet question

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My "new" Pratt &Whitney 3C horizontal bench mill uses unobtainium 4pn collets that have external threads and use a draw tube. The collets have no key way like R8 collets and just use friction to turn with the spindle (is that the right term?). I am going to try using an R8 collet because it is 0.05" smaller in diameter but slightly longer and I'll make a draw bar and rely on the same friction fit to turn the collets. Is there a reason that won't work? If you need a draw bar for R8 collets, why does it need the key and key-way? Am I missing something?

Tailstock clamp revisited

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Some time back I wrote about the tailstock on my Enco 13X40 lathe slipping while drilling. After some modifications to the flats that engage the lathe frame under the ways the problem is about 90% overcome. I finally got to put it to a real test by drilling a 3/8" pilot hole in a piece of 1018 for about 2.5 inches. At the outset the TS could be moved with a moderate force on the wheel, however the bit was advancing while making chips. After adjusting the eccentric under the TS closer to camming over (going through) it stayed in place for the final 1" of drilling. The hole was expanded to 1/2" and went a little beyond the end of the pilot hole and the TS did not slip. My drilling technique is to keep chips coming with moderate pressure on the wheel. During the drilling it seems like I can feel the leadscrew advances the bit each rotation of the project material with moderate pressure on the wheel. At least I am satisfied that I can drill just about anything in my upcoming...

Internal tool for external threads?

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Without getting into a debate about the best single point threading methods, my question is this: Will using a right hand internal lay down threading tool, with full profile inserts, cut correct external threads, when used on the back of the part, with the lathe running in reverse, feeding left to right?
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