[Azalin]

I'm thinking to make some tool holders for my BT30 spindle with my CNC lathe. Accuracy is not a problem. I and the lathe can handle this. However I'm not able to grind the taper for a nice finish because I don't have a grinding attachment on the lathe. Is this a problem? Though, finishing results of my lathe is not bad at all.

So, is grinding on a tool holder cone a must?

[CNCMachineplans]

I wouldn’t bother. You can buy them for $20-30 of aliexpress.


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[Azalin]

By "some" I actually meant "lots of". I need about 20 tool holders because I have only 1 right now. So 20 tool holders + shipping will cost a bunch of money. Would you still buy or make?

[CNCMachineplans]

I would spend more time making money than trying to make consistent tool holders.


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[Azalin]

I see your point but I'm a hobbyist. I don't make money with my machines.

[asuratman]

Your cnc lathe can do it precisely, why not give a try. If you purchase a lot of BT30, the problem is shipping cost maybe too expensive. I maybe do it too in my spare time if I have done retrofitting my cnc lathe.

[Superman]

What RPM would you be running them at ?

any speeds above 8000 need to be accurately balanced. plus you need to maintain a very high accuracy between taper and the bore that holds the cutters. I would guess that turned holders would be a little sloppy and used to a max RPM of say

your cutters would also fail quickly as they would not run quite true & will cut oversize.

I wouldn't purchase 20 holders... get 5 see how they perform.
say
1 face mill holder
1 drill chuck
3 er16 collet + collets ( holds up to 10mm cutters)
you could manufacture the sidelock holders as required

[dbsharp]

Call me crazy, but I was going to attempt a shrink fit solid " bushing" to fit in my PC router in place of a collet. I figured I can machine it all in one setup on the lathe and ream the Id to accurate size for shrink fit. If it works, I would not have to measure tool height every time i change it. You could always get a used toolpost grinder. I found a Dumore grinder for 200 buck on ebay that needed a little TLC, now i can grind pretty decent. Could probably machine, heat treat, grind on the cheap if thats something you think you'd enjoy doing.