Hoss ATC Project

[hoss2006]

Hey Gang,
Can anyone tell me the total length of the R8 drawbar for the X3?
Also, any source to buy a replacement?
Grizzlytools shows one in their parts list but doesn't give the length.
Thanks Hoss

[rustamd]

This seems like the one:

http://littlemachineshop.com/product...3018&category=

[hoss2006]

OK Great, thanks.
Still would like to know the length first to see if it will work for what i had in mind.
Thanks Hoss

[rustamd]

i know it can be hard to find length of draw bar online, unless someone has posted on forum or something. Couple weeks back i was trying to find length of Bridgeport M head draw bar to make my own, but had no luck, ended up buying used one localy

[M100]

From a UK supplied X3 R8 with metric leadscrews:

Length from bottom of head to end of thread 10.75" 273mm
Threaded length 1.25" 32mm
Thread 7/16" - 20tpi (UNF)
Head across flats 17mm

[hoss2006]

Thanks M100,
As I was thinking it's a little long for what I want.
I made my own about 6 5/8 long.
Can you guess what it's for?
Power Drawbar.
Step one of the ATC.
Hoss

[digits]

Originally Posted by hoss2006 Thanks M100, As I was thinking it's a little long for what I want. I made my own about 6 5/8 long. Can you guess what it's for? Power Drawbar. Step one of the ATC. Hoss

Very nice I look forward to seeing this ATC project unfold.

Have you sorted out mist/flood coolant yet - I would have thought that it's essential if you want to run unattended?

[hoss2006]

Hey Digits,
I decided on flood coolant with an enclosure made from wood covered with a
few coats of Herculiner liquid truck bed liner.
The ATC will be a little more fun to tackle so I'm gonna do it first.
Hoss

[ZipSnipe]

Hey hoss, just take a depth gage stick it in the spindle upside down , get that measurement , then measure from the top of the drawbar nut to the bottom of spidle and deduct your first measurement.

[RedDog22]

Hey Hoss. Great to see you starting this! I cant wait to see what you come up with. I'm slowly getting things on paper to start designing my own as well. A quick question. How much force is required to hold the tool holder? The LMS one says they're doing 1000lbs. Thats going to take a huge air piston to move at 100psi.

Thanks!

[hoss2006]

Hey Red,
I read somewhere that 600 lbs is enough force to hold a tool in an R8 collet.
So far I've found these cheap Bimba's at Surplus Center that put out 440 lbs.
With leverage, it should work just fine. At only $3.95, it's worth experimenting with.
Probably get a few just to have them.
The cam and lever only needs to move the collet about 1/8 inch I figure.
Later Hoss
http://www.hossmachine.com

[RedDog22]

Awesome. Thanks for the info.

(removed post because I'm stupid)