O/T Twist Drills

[Guest CNC Apps Guy 1]

Ya know.... as I was setting up a new drill in a collet holder (commoon practice for me) I got to thinking, what kind of rocket scientist would think it's a good idea to STAMP on the shank of a tool??? It took 3 shots to get the tool concentric within .0003"

 

James teh thinking out loud...

[Rekd™]

Oh, you mean they don't just go in a drill motor?

[chris m]

You don't think that the giant roll-stamped distorted mess on the shank is conducive to good holemaking?!?

 

A$$holes...

 

Chris teh my guys have to stone drill shanks or I lose my mind

[McRae]

James,

 

I would suggest the use of a higher quality drill for your .0003" requirements. PTD has an undercut area on the drill shank where the part numbers are rolled on. Some of the more economical series jobber drills are manufactured off shore and marketed locally at an unbelivable prices but this step is omitted.

 

I like the parabolic flute HSCO drills - Coated ofcoarse, but its your money that I am spending on this application right!

[chip]

I don't think I have ever checked run out on a drill.

 

good point though........

[Noel]

How about when the manual guys borrow a drill and bring it back after it has been scored to crap in a drill chuck. They dont spin to true after that.

 

 

Noel

[robk]

At least all the solid carbide drills that we use are either laser engraved or electroetched. You figure they would do the same on HSS

[?Mark]

I just got an indexable drill last week put it in a commmand xt collet chuck on a mori mill and... .003" runout (yes .003").

Called local rep who told me it's within a tolerance!!! WTF

If we made parts like this we would be out of business.

 

Mark

[Guest CNC Apps Guy 1]

I thought I was the only one not pleased with this practice.

[chris m]

Precision Twist seems to alternate between stamping and laser; or the different sizes have been in stock for different times...WTF?

 

My personal favorite are carbide reamers: $40 gets you a 3mm reamer that runs .0001 on the shank at the collet chuck and .0009 flute-to-flute; WTF is that about? Then they say, 'Oh, grinding the flutes concentric to the shank is an additional charge...'

 

Yeah, $40 for something 1/2 the size of a pencil is soooooooooo reasonable to start with

 

F_cking crooks

 

C