ADA: Ask Doc Anything!

[Walker]

The only thing I've found local (used) is this:


The guy bought it from an estate sale and WYSIWYG for $1050.... No tooling, no chucks, just as seen (amid the other clutter).

[Walker]

Doc,

What barrel threads are these?


Found on:

[Loophole]

Doc,

What barrel threads are these?


Found on:

Looks the exact same as my mini-buzzard! Doc is currently making me a freak bored barrel for mine... I'm curious if it would fit yours without modification!


Here's a photo of the threads.

[Walker]

Similar setup, but different distances.

[mustangii]

how long is shipping from Alaska to Missouri? just a joke. bought some vm-68 side rails from you on ebay, lol
edm

[DocsMachine]

The only thing I've found local (used) is this: The guy bought it from an estate sale and WYSIWYG for $1050.... No tooling, no chucks, just as seen (amid the other clutter).

-I'm not overly familiar with the little Emcos, but I'm given to understand that generally, they're pretty light duty- even for a tabletop machine- and limited in features. I seem to recall them having an odd or possibly unique way to mount the chuck, so you either need to find an Emco chuck or make your own backing plate for a different one.

Personally, a thousand bucks with zero accessories is at least fifty percent too high.

What barrel threads are these?

-Just from the photo, and being Carter-based, I'd guess Loopy is right- it's a more-or-less 'Cocker based thread, missing the Carter bore sizers. It looks very close to 20 TPI.

Then again, Carters were generally handmade, it could be "whatever Earon decided to use that day".

how long is shipping from Alaska to Missouri? just a joke. bought some vm-68 side rails from you on ebay[.]

-Generally about three or four days for Priority, four or five for First Class. Your package should have been delivered by the time you probably read this.

Doc.

[Walker]

Thanks Doc, I guess I need to pick up thread gauges also. The threads do look like Cocker, but the OD of the rear of the barrels are different. The Carter is .830, where a stock Cocker barrel is .865... They will not interchange for sure... If the Emco would have came from the original owner, with the tools, I would consider it. But otherwise, I'll pass and probably go new.

[DocsMachine]

Huh. Well, like I said, it could be "whatever Earon wanted".

Doc.

[Walker]

https://littlemachineshop.com/products/product_view.php?ProductID=4962

https://littlemachineshop.com/products/product_view.php?ProductID=4959

[XEMON]

-I'm not overly familiar with the little Emcos, but I'm given to understand that generally, they're pretty light duty- even for a tabletop machine- and limited in features. I seem to recall them having an odd or possibly unique way to mount the chuck, so you either need to find an Emco chuck or make your own backing plate for a different one.

Personally, a thousand bucks with zero accessories is at least fifty percent too high.

I have an Emco Compact 5 CNC and they are beast ...
They are a bit on the light duty, but are incredible precision machines. I've seen machine shop using them for titanium watch cases production.
my oem 3 jay chuck has 1.5thou runout about an inch out on gauge pins without dialing it in ...

1K seam a bit high, but the milling attachment go for 5-800 alone (its absolutely unusable for anything other than cutting Styrofoam)
the manual version usually go for 500 to 1500 depending on attachment and the CNC for 800-2500 depending on attachments and generation of electronics.

it seam like there is a collet holder without the nut on there. it takes er25 collet.

the chuck has 2 way to mount, both "proprietary", one is a 3 bolt pattern and the other is a 4 bolt pattern; no special threads or locking mechanism.

Walker feel free to ask anything you want on those little guys, i have lost of stuff on them.

[Walker]

Thanks my friend... If I go that way, I'll definitely reach out.

[DocsMachine]

X: I recently picked up a turret tool changer for a Compact 5, that I plan to retrofit to my Logan-based CNC lathe. Another guy with the same Centroid controller did that, and has worked out the hows and wherefores- it's not going to be easy, but it's known-doable.

Doc.

[XEMON]

I have one of those, 6 positions, really sturdy and stable.
they are super repeatable because of the ratchetting mechanism inside (they turn 1 position forward, then backtrack to set into the ratchet to take the slack off; at least with the OEM control code).
but dont forget your calendars and MtDew warmer because they are suuuuuuper slooooowwwwwww ....

[Cal440]

I am new to the Sheridan line was wondering what makes the speed demon bolt so sought after for a upgrade. Thanks

[XEMON]

When you pull the handle it retract the anti-return bbs making the pump stroke a bit smoother and easier.
It was originally an after market upgrade that was eventually integrated as a standard item on the later Sheridan's.

[DocsMachine]

Xe has it. A considerably smoother pump stroke is pretty much it. There's also a version for the PGP that makes it centerfire, but I've never seen a measurable performance benefit with that.

Doc.

[Cal440]

Thanks for the quick answer, much appreciated