Best CAT40 and CAT50 toolholders for HSS jobber drills?

[Matthew Hajicek - Singularity]

We use Command ER collet holders for drills (cutting soft and semi-hard H13) and the guys on the floor say that no matter how hard they torque them the drills keep pushing up into the holder. I suggested collet nuts with bearings and the boss said it's been tried and didn't help. Is there a better type of holder for this application, or do I need to back off on chipload?

[Joe788]

Are they getting them over 100ft/lbs? I'm not sure about Command, but Techniks recommends 100ft/lbs of torque. Unless they have the fancy spanner attachment on a big torque wrench or breaker bar, they might not be getting them tight enough.

 

Also, what size drills are pushing back?

[?Mark]

You can get those collets in .5mm increments (and inch fractions) which I highly recommend. Never had tool pushed in and I've used command er and xt style "forever"

[Matthew Hajicek - Singularity]

Also, what size drills are pushing back?

 

7/16" to 9/16"

[specv]

we use http://universaldevlieg.com/index.html holders/collets and they work great.

[Chris Rizzo]

Er-32? I'd bet something else is going on. Do the drills have the size stamped on them (vs printed)? If so that will severely limit clamping force and make runout horrific. Are the collets clean and burr free? Are the drill shanks burr free? Anything less than good smooth shanks and new collets = slippage no matter how hard you tighten or what kind of nuts.

I used to use an ultrasonic cleaner for everything, then dip collet and nut in wd-40 before install. Allowed a much more consistent torque.

[Matthew Hajicek - Singularity]

Thanks Chris, I think you nailed it. Some are good, some are stamped, and some have been spun in a drill chuck on the Bridgeport.

[jeff]

Command is a pretty good quality brand, I'm with Rizzo on this one.

Also, are they trying to use a collet that won't collapse enough?

 

The only time I have drills slip on me in my ER32 collets is if it gets really dull.