• PHISHING SCAM attempt TARGETING HOBBY-MACHINIST members. It has been brought to our attention that a pop-up survey is soliciting userfeedback from H-M members. In exchange for survey information, the user is given an opportunity to win a prize if they pay for shipping charges. This is NOT a Hobby Machinist program, survey or contest. DO NOT click through the links. Close your browser immediately and restart your computer. Clear cookies, cache and log back into Hobby Machinist. Again, this is NOT a Hobby Machinist contest or survey - IT IS a PHISHING SCAM attempt to get your credit card information.To close this notification, click the "X" in the top right corner of this box.

What lathe attachment do I need?

tjb

H-M Supporter - Sustaining Member
H-M Platinum Supporter
Joined
May 3, 2017
Messages
842
I have a 13 x 40 lathe that will hold stock up to 1 1/2" in diameter. I need to face a piece of 3/4" stock and a piece of 1" stock, both of which are 2+ feet long. When I put either of them in the machine, the excessive length sticking out the back wobbles significantly. Is there an attachment I can use to lock down the stock and eliminate the wobble?

Thanks for any advice.

Best regards,
Terry
 

Ed ke6bnl

Registered
Registered
Joined
Nov 20, 2014
Messages
635
People will make an atachment for the rear of the lathe that hopefully can fit over the rear of the spindle with 4 screws around the circumference that are adjustable to center the sticking out portion of the work stock I believe it is called a spider.
 

tjb

H-M Supporter - Sustaining Member
H-M Platinum Supporter
Joined
May 3, 2017
Messages
842
People will make an atachment for the rear of the lathe that hopefully can fit over the rear of the spindle with 4 screws around the circumference that are adjustable to center the sticking out portion of the work stock I believe it is called a spider.
Thanks, Ed.

I'll do a search on that.

Regards,
Terry
 

RJSakowski

H-M Supporter - Gold Member
H-M Supporter Gold Member
Joined
Feb 1, 2015
Messages
5,185
For one or two pieces, I would just use three or four tapered wooden shims to center and stabilize the back end of the stock.
 

tjb

H-M Supporter - Sustaining Member
H-M Platinum Supporter
Joined
May 3, 2017
Messages
842
Thanks, RJ.

That's a good quick-and-dirty tip to know. I'm actually right now watching a youtube video on a guy making a spider. Seems like it might be a good learning experience to make one. I'll keep you posted.

Regards,
Terry
 

tjb

H-M Supporter - Sustaining Member
H-M Platinum Supporter
Joined
May 3, 2017
Messages
842
making a spider
Thanks, Ed.

That's actually the video I just watched! Seems pretty straightforward.

Headed back to the shop to try and butcher a little bit of scrap metal.

Regards,
Terry
 

kd4gij

Active User
Registered
Joined
Feb 7, 2011
Messages
4,925
Sounds like the stock is bent. I would straighten it then run it.
 

tjb

H-M Supporter - Sustaining Member
H-M Platinum Supporter
Joined
May 3, 2017
Messages
842
I made plugs from Delrin with different size wholes for my lathe.
Now that's a good idea. Do they simply press in or did you make a retainer of some sort?

Regards,
Terry
 

tjb

H-M Supporter - Sustaining Member
H-M Platinum Supporter
Joined
May 3, 2017
Messages
842
Just a snug fit. I left a shoulder on the plug to pull it out..
Thanks. I'll try that, too. I have a piece of scrap 2 3/4" cold rolled that I've already started milling for a lathe spider. Seems like a pretty simple exercise, so I'll finish it. I also have some scrap Delrin that I could use to make plugs. I'll probably make some for the common smaller sizes (3/8" - 3/4"). Thanks for the tip.

Regards,
Terry
 

Dabbler

Administrator
Staff member
H-M Supporter Gold Member
Joined
Oct 11, 2016
Messages
1,436
I did the same as kd4gij, but I turned mine out of wood, usually a 2 X 4, to size. I've only needed a couple of sizes. I regularly turn 1.375" steel , 4' long suing these wooden plugs.

I can turn 3/4 " stock uip to 3' long using a wooden plug as well...

 

P. Waller

Brass
Former Member
Joined
Mar 10, 2018
Messages
921
Make short spindle liners, use a piece of material (I mostly use plastic) and turn it slightly smaller then the spindle bore then bore it slightly larger then the stock and 1 1/2" long or so, drill and tap a hole through the wall. Place on stock and gently snug a set screw onto the stock.

If the wall thickness will not allow a tapped hole use a cats head setup.

This allows you to move the stock through the spindle if making multiple parts in one setup. This beats screwing around with a cats head and screws for every part.

Like so
 

Aaron_W

H-M Supporter - Gold Member
H-M Supporter Gold Member
Joined
Nov 14, 2016
Messages
1,108
Perhaps my inexperience speaking, but couldn't you just use your steady rest to work further down the bed so you have less material extending through the headstock? I thought that is what the steady rest was for?
 

Dabbler

Administrator
Staff member
H-M Supporter Gold Member
Joined
Oct 11, 2016
Messages
1,436
Aaron, it just takes much more time to set up your steady rest than gripping in your 3-jaw and going for it. all your are doing is reducing the 'whipping effect by using a plug. I think I've needed 3 or 4 plugs in 38 years, and they each took about 5 minutes to make.
 

P. Waller

Brass
Former Member
Joined
Mar 10, 2018
Messages
921
Perhaps my inexperience speaking, but couldn't you just use your steady rest to work further down the bed so you have less material extending through the headstock? I thought that is what the steady rest was for?
Setting up a steady would be silly if all one needs to do is stabilize material that fits through the spindle bore, if the work will not pass through the spindle a steady is the only option.

As an example this part would not fit through the spindle so I had to use a steady to turn the section that was welded for repair. I also made a center plug for the bore in the end and used a live center in tail stock.

It turned out reasonably well considering the amount of weld that they put on it.
3.147" is 79.93 MM for an 80 MM bearing fit. The material is 304/316 stainless, the Customer was not sure.



 

tjb

H-M Supporter - Sustaining Member
H-M Platinum Supporter
Joined
May 3, 2017
Messages
842
Sounds like there's definitely more than one way to skin this cat. Thanks for all the answers and great ideas.

Regards,
Terry
 

epanzella

Active User
Registered
Joined
Apr 8, 2013
Messages
1,268
For a quick job I stuff some paper towels around a long shaft to stop wobble. That said it seems odd the 3/4 and 1 inch shafting only 2 ft long would flex enough to be a problem.
 

savarin

Active User
H-M Platinum Supporter
Joined
Aug 22, 2012
Messages
2,616
I have used bicycle cables looped over the length sticking out and pinned to the wall and ceiling as guy ropes, a splash of oil where they touch the shaft and it spins with no wobble.
I find this particularly useful with thin stock
 

tjb

H-M Supporter - Sustaining Member
H-M Platinum Supporter
Joined
May 3, 2017
Messages
842
For a quick job I stuff some paper towels around a long shaft to stop wobble. That said it seems odd the 3/4 and 1 inch shafting only 2 ft long would flex enough to be a problem.
Actually, it may not be a problem for the immediate project I'm working on. There is definite wobbling, but maybe not significant enough to cause a problem.

I have rarely work with anything longer than about 2 or 2 and a half feet, but several weeks ago, I had a longer piece of 1/2" stock in the lathe. I was facing the end when all of a sudden, the lathe starts wobbling and making a racket that sounded like a helicopter about to lift off. I slammed the lathe emergency button and went around to the outboard side. The stock had bent to 45 degrees about a foot out from the end. Luckily, nothing (and no one) was in the path of destruction when the flailing began, but now I'm a little gun shy. To me, this is a win-win: Getting some wise counsel from experts on how to avoid a catastrophe, and a learning exercise on how to make a useful lathe attachment.

Regards,
Terry
 

12bolts

Global Moderator
Registered
Joined
Apr 23, 2011
Messages
2,476
Place a suitable sized sawhorse or similar near the end of your stock Nail or screw a couple of blocks of wood to cradle and bridge over the stock. Away you go.
Sounds like the stock is bent. I would straighten it then run it.
Straight or not, excess stock protruding from the rear of the spindle will wobble. It is necessary to restrain it.
I have used bicycle cables looped over the length sticking out and pinned to the wall and ceiling as guy ropes, a splash of oil where they touch the shaft......
Charles' method is also effective

Cheers Phil
 
  • Like
Reactions: tjb

tjb

H-M Supporter - Sustaining Member
H-M Platinum Supporter
Joined
May 3, 2017
Messages
842
Sounds like the stock is bent. I would straighten it then run it.
No, the stock's not bent. See my post above on the near train wreck I had with a longer piece of 1/2" stock. These two pieces are a. shorter than that one, and b. only 'wobbling'. My main objective is to learn what's available out there to avoid another potential train wreck before it happens. I just finished milling the blank for a spider. If all goes well, tomorrow I'll drill and tap for the set screws, then try it out.

Next project will be to make some Delrin plugs like you suggested.

Regards,
Terry
 

epanzella

Active User
Registered
Joined
Apr 8, 2013
Messages
1,268
No, the stock's not bent. See my post above on the near train wreck I had with a longer piece of 1/2" stock. These two pieces are a. shorter than that one, and b. only 'wobbling'. My main objective is to learn what's available out there to avoid another potential train wreck before it happens. I just finished milling the blank for a spider. If all goes well, tomorrow I'll drill and tap for the set screws, then try it out.

Next project will be to make some Delrin plugs like you suggested.

Regards,
Terry
Sounds like you're on the right track with the spider. Remember any fixed plugs you make will only work with a specific diameter rod whereas the spider will work with anything that fits thru the headstock and is long enough to reach it.
 
  • Like
Reactions: tjb

tjb

H-M Supporter - Sustaining Member
H-M Platinum Supporter
Joined
May 3, 2017
Messages
842
Sounds like you're on the right track with the spider. Remember any fixed plugs you make will only work with a specific diameter rod whereas the spider will work with anything that fits thru the headstock and is long enough to reach it.
Got it. Thanks.

Regards,
Terry
 
It can take up to an hour for ads to appear on the page. See our code implementation guide for more details. If you already have Auto ad code on your pages there's no need to replace it with this code
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock