Cole2534
Diamond
- Joined
- Sep 10, 2010
- Location
- Oklahoma City, OK
No different than cutting soft jaws. Do it once, use 'em again.Thinking that all of that fucking around costs $0 is a recipe to stay poor.
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No different than cutting soft jaws. Do it once, use 'em again.Thinking that all of that fucking around costs $0 is a recipe to stay poor.
How much undersize are you boring them?I use the Dunham style......bought a set.....they are way to $$$$ for what they are.................I roll my own now. I just make the 1.5"Ø shank integral with the puller.
.015-.020" under nominal..........How much undersize are you boring them?
I tried .030 on a 1-3/8" nom...was a wee bit too much..015-.020" under nominal..........
And it makes a difference how "flexy" the fingers are....................I tried .030 on a 1-3/8" nom...was a wee bit too much.
I did the same thing on some 7/16" SST hex, that I needed to make a few K worth of 1/4-20 LH bolts. I used my 0.079"w (relieved) Iscar Top Grip to part off the last run part, and put a groove just into the next part. The groove was .38" OD so no worries about cleaning the OD to Ø.247 prior to threading.I'm a cheapass, or maybe just poor, IDK. Anyway, bar pulling means parting off. When part geometry allows, I'll using the parting tool to put a groove in the stock. I then mill a piece of .5" x 2.0" AL into a fork that engages this groove. The groove is 0.118" wide so I'll machine the fork to be 0.100" thick in the requisite area, the rest stays the nominal .5" thickness.
I get repetitive pulls with positive engagement for basically $0.
Exactly. I leave the shank in the turret and screw on forks as needed. since they're all built the same they repeat well enough that I rarely adjust anything.I did the same thing on some 7/16" SST hex, that I needed to make a few K worth of 1/4-20 LH bolts. I used my 0.079"w (relieved) Iscar Top Grip to part off the last run part, and put a groove just into the next part. The groove was .38" OD so no worries about cleaning the OD to Ø.247 prior to threading.
I used this little saw arbor, and some 15 gage Al sheet to make this little 'fork' for lack of a better term. It rocked all 3000 little bolts without a hickup.
Doug.View attachment 377632
This is the same style we use in our Lathes. Works great and the replacement fingers are cheap and easily made.I have used the coolant activated (on a 300psi machine) and it worked okay, for small, lightweight stuff.
We have made our own Dunham style pullers, prior to getting one of these and have not looked back.
I don't remember buying this from Royal (and spending almost $700) but from US Shop Tools or fleabay.
CNC LATHE BAR PULLER 1" SHANK | eBay
View attachment 294043
Doug.
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