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I could really use some advice about making a part...

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The Fishing Hobby

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I have gotten a lot done on a lathe that I'm cleaning up to use and I started a thread about it here: https://www.hobby-machinist.com/threads/new-to-me-compact-8-cleanup-thread.74067/
I didn't notice that the cross slide lead screw mount was broken until I was taking it apart. This one looks like someone either used solder of possibly jb weld to try and keep it pieced together and painted over it, but when I took it off, it just fell apart into 3 pieces. It seemed to work great but it can't be good to leave it pieced together like it was. I'm good at taking things apart and putting them back together, but I'm no machinist (yet :D). Can anyone tell me how I could make a part like this and have it work out well? I'd love to do one in aluminum if possible. I priced used cross slides on eBay but they are really pricey and they would still have the zamak screw mount that could possibly cause problems later.
Could anyone give me some pointers on a way to tackle making something like that. I only have an older 7x10 HF lathe and drill press so I'm limited on tools to help with the job. I do have a lot of wood working tools (table saw, bandsaw, routers ect) but I'm afraid they won't be real helpful for this.

Anyone have an advise on what I could make given the tools I currently own? Thanks for advice anyone may have!IMG_20181108_084816.jpgIMG_20181108_084826.jpgIMG_20181108_084903.jpgIMG_20181108_084916.jpg
 

francist

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Can you give us an indication of size, please? Maybe a shot of one of the pieces next to a small scale or something? I have a feeling the part is small, just not sure how small.

-frank
 

The Fishing Hobby

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Can you give us an indication of size, please? Maybe a shot of one of the pieces next to a small scale or something? I have a feeling the part is small, just not sure how small.

-frank
Sure thing! It is about 2.5" long, 2-3/8" across the flange that mounts to the cross slide and the round part on the crank handle side is about 2-5/8" in diameter. The hollow bar like section in between is about 1" across and about 9/16" tall. Here are a few more pictures:IMG_20181108_220834.jpgIMG_20181108_221555.jpgIMG_20181108_221627.jpgIMG_20181108_221636.jpg
 

T. J.

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What about turning the basic shape from round stock. It would basically look like a dumbbell. Bore the center hole while in the lathe. Then, using a hacksaw or bandsaw, cut out the shape of the mounting flange on one end. Then drill the two mounting holes.
 

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The Fishing Hobby

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What about turning the basic shape from round stock. It would basically look like a dumbbell. Bore the center hole while in the lathe. Then, using a hacksaw or bandsaw, cut out the shape of the mounting flange on one end. Then drill the two mounting holes.
That sounds like it might work! I was just looking around online and noticed the Grizzly G4000 looks like it is very similar to the Emco Compact 8 that I have. That part looks very much like mine. I may see if I can order one from them and then possibly make a better one later. That would allow me to get it up and running...if it would actually work.
 

francist

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I wonder, would you be able to make it out of one round of aluminum on the old lathe. Start with a round cylinder, neck down the centre to make kind of a spool shape, drill through the centre for the lead screw. Dismount from the lathe and slice (hacksaw) two segments off one end to form the rectangular flange. If the centre part needs clearance on the top, file or grind that flat. This scenario provides for the lead screw to be totally enclosed in the aluminum, but I don't think that really matters much. I suspect the open part of the original was just to facilitate casting without having to use a core mould.
image.png

I see others have responded whilst I was fooling around sketching! ;)

-frank
 

The Fishing Hobby

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I wonder, would you be able to make it out of one round of aluminum on the old lathe. Start with a round cylinder, neck down the centre to make kind of a spool shape, drill through the centre for the lead screw. Dismount from the lathe and slice (hacksaw) two segments off one end to form the rectangular flange. If the centre part needs clearance on the top, file or grind that flat. This scenario provides for the lead screw to be totally enclosed in the aluminum, but I don't think that really matters much. I suspect the open part of the original was just to facilitate casting without having to use a core mould.
View attachment 279389

I see others have responded whilst I was fooling around sketching! ;)

-frank
That is a great idea too. I just checked the lead screw and it is the same diameter throughout that end of it so that could work too!
 

The Fishing Hobby

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Frank, you drew exactly what I had in mind. Now if you could produce some CAD drawings from all the other ideas I've got in my head, I would be much obliged!:laughing:
Great minds think alike! Y'all were definitely on the same track :encourage:
 

mikey

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You should also try contacting the ebay guy, emco_hobby_shop to see if he has one he hasn't listed. If that fails and the grizzly thing fails then here is someone in California with one for sale: https://sfbay.craigslist.org/sby/tls/d/emco-lathe-parts/6743118157.htmll. I would not pay what he's asking - maybe dicker with the guy.

This part used to be sold by someone on ebay who machined it from solid stock. I can't find it anymore, sorry.
 

The Fishing Hobby

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You should also try contacting the ebay guy, emco_hobby_shop to see if he has one he hasn't listed. If that fails and the grizzly thing fails then here is someone in California with one for sale: https://sfbay.craigslist.org/sby/tls/d/emco-lathe-parts/6743118157.htmll. I would not pay what he's asking - maybe dicker with the guy.

This part used to be sold by someone on ebay who machined it from solid stock. I can't find it anymore, sorry.
The Grizzly one sure does look right! It is cheap and at their parts place about 3 hours from my house so I should get it quick. It looks to be solid too which would be great if it fits! It almost looks like aluminium but it is hard to tell.
Here are the pictures they have on their site:
part.png
 

mikey

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Like I said, the Compact 8 was cloned for many years into the ubiquitous 9x20 lathes so it is possible the casting might fit. Fingers crossed.
 

The Fishing Hobby

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Your comment was what got me looking around! I remembered you said that so I started looking and found this one. I really think it is going to work. If so, I will make sure to update here in case others may need one for an Emco Compact 8. I will also post it in the Emco forum.
 

markba633csi

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I've heard that part is a weak link on these lathes, possibly due to "zinc pest" ; a deterioration which affects zamak parts due to impurities in the zinc
People who collect rare die cast toys sometimes encounter it- in severe cases the metal can literally crumble to dust
mark
 

ttabbal

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If it doesn't work, you might be able to make the part you can on the lathe and I bet someone here with a mill would be willing to mill the flats for you.

If you end up looking for a milling attachment, there are a few of us with them sitting around. I have one of these.. http://www.grizzly.com/products/Grizzly-Milling-Attachment-for-G4000/T10721

Decent part, but I ended up buying a Bridgeport. I'm sure I'm not the only one to do something like that. :)
 

The Fishing Hobby

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If it doesn't work, you might be able to make the part you can on the lathe and I bet someone here with a mill would be willing to mill the flats for you.

If you end up looking for a milling attachment, there are a few of us with them sitting around. I have one of these.. http://www.grizzly.com/products/Grizzly-Milling-Attachment-for-G4000/T10721

Decent part, but I ended up buying a Bridgeport. I'm sure I'm not the only one to do something like that. :)
I could absolutely use one of those!
 

The Fishing Hobby

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I've heard that part is a weak link on these lathes, possibly due to "zinc pest" ; a deterioration which affects zamak parts due to impurities in the zinc
People who collect rare die cast toys sometimes encounter it- in severe cases the metal can literally crumble to dust
mark
I read that too so I went ahead and ordered the little one for the compound and some other miscellaneous parts as well. I will be sure to update this post and create a new post over in the EMCO section that will go over all the parts that are a good match so others searching in the future will be able to find that info.
 

The Fishing Hobby

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Funds are a little tight right now, but I will be looking for something like that in the future. I will be sure to check with everyone about it!
 

cathead

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Maybe you have a welder or acetylene torch in your shop..................:sherlock: or a friend who has one................:idea:

The casting is good enough to use as a pattern for making the part out of steel. It could be made in three pieces
and put together in "weldment" style. The weldment would be much stronger than the original part so would be
a nice improvement. Another option would be to silver solder the three pieces together which would allow easy
positioning of the pieces and repositioning them if needed. The round part could be made on the lathe and
the remaining parts roughed out with a hack saw and file.
 

The Fishing Hobby

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OK, here is an update on the leadscrew mount for the cross slide that I ordered from Grizzly that is made for the G4000 lathe. The part is 3mm shorter than the Compact 8 version but works perfectly fine without a spacer block to make up the difference in the shorter part. The only thing I did was add a thin washer that I made out of HDPE between the handwheel and the leadscrew mount. The reason I did this is because the Grizzly leadscrew mount is made out of steel and has a surface that almost feels like it is etched. When you turned the handwheel (which is aluminum) it felt like sandpaper was between the two parts. HDPE wears well and really smoothed out the feel while turning the handwheel. Smooth as glass now and works great! If you take a look at the picture you can see there is a gap between the handwheel/micrometer collar. That is where the HDPE washer is between the two parts. The only other thing I had to do was open up the hole for the leadscrew shaft about .15mm on handwheel side of the new part. The hole is fine throughout most of the length but about 3/4 of an inch from the end where the shaft comes through was just a bit too small in diameter for the shaft to fit through.
It wasn't exactly a plug and play part, but it was easy enough to make it work and the part should be much more durable than the original!
IMG_20181116_102238.jpg
 

The Fishing Hobby

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Oh, I forgot to mention. The part may not be steel. It may be cast iron or possibly even 3d printed metal???
I know magnets stick to it and it is heavy. When I drilled the hole out slightly larger it didn't make any curls or chips like steel normally does. It drilled very easily and made a fine black powder instead of cut bits of metal. Any ideas? I'm not very experienced with metal work but I have drilled steel plenty and this didn't seem like normal steel when I drilled it.
 

The Fishing Hobby

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I knew that metal powder is used in metal 3d printing, I didn't know that it was used prior to that but it makes sense! Thanks, I learned something new today :encourage:
The part is nice and seems pretty sturdy, I think it will hold up well.
 
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