I'm looking at making a basic QCTP, either using Greg's design from here, or a Jon Stephenson style.
I've got a 14" lathe so intend to go with the CXA size toolpost and would like to use the "standard" dovetail dimensions for compatibility in case I ever get a real toolpost.
Does anyone happen to have accurate dimensions for a CXA toolholder dovetail. I thought I had found and saved some previously but can't seem to track them down. I can find dimensions online for other sizes, but not CXA.
Steve
(02-12-2018, 10:19 PM)f350ca Wrote: [ -> ]This store site seams to list them Steve.
https://www.accusizetools.com/quick-change-tool-posts/
Smart move, when I built mine it never crossed my mind to make them to a standard. Guess all the really high end stuff is proprietary. Thats my story and Im sticking to it.
Awesome - thanks Greg. Plenty of sites have the post dimensions and all the toolholder dimension EXCEPT the dovetail.
LOL - yeah, after having high quality custom made tooling I'm sure you'll never come back to standard commercial stuff ;)
You've been using yours for a long time now. Anything you'd change/improve?
Steve
Its stood up amazingly well Steve. I lucked into a really hard piece of mystery metal when I made the body. Was a bugger to work with but worth the effort. To do it again I'd spend the money on a chunk of 4140 heat treated or similar to get the hardness again. Only complaint is you have to really synch it down or it will rotate on the compound under a hard cut. Thats with the bottom relieved so that only a small ring touches on the outside edge.
Same with the cam that pushes the locking pins. Mind you the pins are brass and they still work.
Thanks Greg. I'll keep a lookout for some decent material to make it from. Think I know where there's some mystery shafting that might fit the bill.
Had a couple of dovetail cutters turn up yesterday, so slowly gathering what I need.
I got lucky and picked up a couple of free scrap forklift tynes a couple of weeks ago - so should have plenty of material for the holders.
Steve
(02-13-2018, 09:13 AM)f350ca Wrote: [ -> ]...Only complaint is you have to really synch it down or it will rotate on the compound under a hard cut...
Have you tried adding a thrust bearing under the nut?
(02-13-2018, 06:06 PM)Mayhem Wrote: [ -> ] (02-13-2018, 09:13 AM)f350ca Wrote: [ -> ]...Only complaint is you have to really synch it down or it will rotate on the compound under a hard cut...
Have you tried adding a thrust bearing under the nut?
Not a proper bearing, using a bronze washer. That might help. Or a longer handle. The CA Dorian on the Summit uses a 1 3/8 wrench so lots of torque