Model Engine Maker

General Category => Chatterbox => Topic started by: steamer on June 20, 2022, 07:03:05 PM

Title: Another interesting lathe attachment
Post by: steamer on June 20, 2022, 07:03:05 PM

Something I think I'd use far more often.....spindle back stop

http://mikesworkshop.weebly.com/chuck-back-stop-and-disc-alignment-tool.html

Title: Re: Another interesting lathe attachment
Post by: Dave Otto on June 21, 2022, 12:22:29 AM

I made one years ago, not as fancy but it does work within limits. The left hand bushing is a slip fit in the spindle bore. The right end has a shoulder that bottoms on the end of the spindle and the small tapered piece causes the split mandrel to expand when tightened.

Dave

Title: Re: Another interesting lathe attachment
Post by: crueby on June 21, 2022, 12:33:47 AM

Does that work sort of like chuck 'spiders', but is adjustable as well where spiders are fixed thickness?

Title: Re: Another interesting lathe attachment
Post by: steamer on June 21, 2022, 01:01:43 AM

Quote from: crueby on June 21, 2022, 12:33:47 AM

Does that work sort of like chuck 'spiders', but is adjustable as well where spiders are fixed thickness?

Yes   and ostensibly, you can fit the end with what ever fitted stop you need for the job at hand.....

Dave

Title: Re: Another interesting lathe attachment
Post by: Thor on June 21, 2022, 07:23:42 AM

 A handy tool to have, I made one for my small lathe (https://b56b541582.cbaul-cdnwnd.com/15a4602be4074f1b8217350ccf583f6b/200000025-1b0e41d004/EmcoC8DepthStop.pdf) many years ago and it is used frequently.

Thor

Title: Re: Another interesting lathe attachment
Post by: steamer on August 21, 2022, 09:46:52 PM

Hey Thor,

Sorry to take so long to get to this I just saw it!!

I like that design a lot!   I just picked up a #3 morse taper blank too!

Dave

Title: Re: Another interesting lathe attachment
Post by: steamer on August 25, 2022, 03:12:26 AM

I ordered material for the back stop today Thor!    Waiting for the weather to get bad, and I'll jump on it!

Dave

Title: Re: Another interesting lathe attachment
Post by: Thor on August 25, 2022, 06:29:39 AM

Hi Dave,

 Good luck with your back stop project.

Thor

Title: Re: Another interesting lathe attachment
Post by: steamer on August 25, 2022, 02:07:20 PM

Thanks Thor,,   I was thinking about this change.....what are your thoughts?

It would amount to a standardized shank on the stop itself which would let me make much smaller diameter stops....It's just an inversion of the current design.

there will be other changes to suite the SB9. but I'll post them when I get to the project.

Dave

Title: Re: Another interesting lathe attachment
Post by: Thor on August 26, 2022, 07:37:04 AM

Hi Dave,

 Looks good to me, why didn't I think of that? :embarassed:

Thor

Title: Re: Another interesting lathe attachment
Post by: steamer on September 22, 2022, 01:57:09 AM

OK   couldn't put this down as I have the coof, and I needed something to do...

Here it is all South Bend-erized....   I still need to figure out draw tube length....

I made this to match the Emco design but with imperial material....Samantha is that kinda lady..

Title: Re: Another interesting lathe attachment
Post by: steamer on September 22, 2022, 02:05:00 AM

For the actual stops, I have a 1/4-28 thread with a 60 degree socket.   That should repeat well enough, and I can take a skim cut before use I suspect.    I have a rage of back stops from 1/4 inch to 2 in

Should be a good start!

Dave

Title: Re: Another interesting lathe attachment
Post by: steamer on September 23, 2022, 04:38:01 AM

There   Ready to build....

Title: Re: Another interesting lathe attachment
Post by: Thor on September 23, 2022, 06:20:39 AM

Hi Dave,

 Your backstop looks good, and good luck with the machining process.

Thor

Title: Re: Another interesting lathe attachment
Post by: steamer on September 23, 2022, 12:46:56 PM

I can see a need for a spider plate to reach around the 3 jaw....but it's an adaptable design..

Dave

Title: Re: Another interesting lathe attachment
Post by: steamer on September 26, 2022, 12:47:54 AM

https://www.facebook.com/100008022455617/videos/1267117790732557/

Title: Re: Another interesting lathe attachment
Post by: Don1966 on September 26, 2022, 04:35:42 PM

Looks good bud I built George Thomas back stop years ago with all the op attachments. Screw cutting ops and back stop ops. It’s a great attachment to have when making screws and facing off.

Don

Title: Re: Another interesting lathe attachment
Post by: mcostello on September 26, 2022, 06:00:49 PM

I am only getting a 10 second video, what am I missing?

Title: Re: Another interesting lathe attachment
Post by: steamer on September 26, 2022, 06:59:57 PM

Quote from: mcostello on September 26, 2022, 06:00:49 PM

I am only getting a 10 second video, what am I missing?

Nothing

Title: Re: Another interesting lathe attachment
Post by: steamer on October 03, 2022, 12:20:19 AM

A bit more progress.    The draw bar is 3/4" welded steel tube, with a threaded plug pressed in the end, and threaded into the Morse Taper 3 sleeve....

The Morse Taper 3 sleeve was machined and marked/indexed to the spindle so that I can put it in at the same position.   As it was bored in place, do this will keep the runout of the armature down to .0005" range which is where it is now....

Coming along nicely....

Title: Re: Another interesting lathe attachment
Post by: Thor on October 03, 2022, 06:13:58 AM

Hi Dave,

 Well done so far, you got less runout than I did.

Thor

Title: Re: Another interesting lathe attachment
Post by: steamer on October 15, 2022, 06:52:26 PM

Done!

Title: Re: Another interesting lathe attachment
Post by: Don1966 on October 15, 2022, 08:07:28 PM

Looks good brother you will enjoy it….. :Love:


 :cheers:
Don

Title: Re: Another interesting lathe attachment
Post by: Thor on October 16, 2022, 08:52:09 AM

 Congratulations Dave, looking very nice. :ThumbsUp:

Thor

Title: Re: Another interesting lathe attachment
Post by: Dave Otto on October 16, 2022, 11:40:00 PM

Nice work Dave!

Dave