Wtb Nmtb 40 Tool Holders

Let me know what you have.

I have very little for my "new to me" mill we are building.

I have extra Morse taper holders, I guess $15 each plus ship.

No such thing as too many tool holders. Have over 50 all set up and defined in the CNC.

eBay is your friend here, watch for large lots.

Also, don't forget that CAT-40 holders have the same taper.

hvontres said:

Also, don't forget that CAT-40 holders have the same taper.

Click to expand...

True, I bought a very special holder that would let me attach thru tool coolant in CAT 40 and converted it to NMTB40. It was a lot of work to modify. You might consider it for something like this specialty tool that is just not available in NMTB40

Karl

I have a number of cat40 holders from when I had my shop, I didn't realize they could be converted over.

I'll have to take a look at that and see what is needed to modify them to fit.

There's a case harden on them that's harder than a hooker's heart, then only real hard under that.

I made a set of very special lathe soft jaws to grip on the 40 taper, holding the tool perfectly on center. that's the hard part of the job.

My plan "A" was to bore and tap the holder. Ain't gonna happen, they are too dang hard.

My particular holder had 5/8x11 threads way on down into the holder. So, I bored the OD of the end of the NMTB (about 0.950" IIRC) an inch or an inch and half deep. Then make a bushing the OD of the end of the NMTB and 5/8X11 thread ID. Take a short section of 4140 grade all thread (bet I used a piece of grade eight bolt and catch both the threads in the bottom of the tool holder and the bushing. I used red locktight all over. Also a couple TIG weld tacks where the bushing meets the taper 40.

If this bushing ever came out, it would be all but impossible to get off the drawbar. I had considered just installing the bushing press fit, but thought it might pull free.