Reconditioning drills
Reconditioning drills
(OP)
Hi everyone.
I'm new to the forum and I am hoping to pick your brains for a minute.
My problem is, is the ammount of drills we are going through.
We are using Guhring tin plated drills to machine forged steel.
We have a drill grinding machine, but the reground drills are obviously not lasting anywhere near as long as the new drills, as we have no way of recoating the tip of the drill after regrinding.
What methods are available to us for recoating drills? Is there any specialist equipment available to anable us to recoat drills in-house?
Thank's for any help/tips.
I'm new to the forum and I am hoping to pick your brains for a minute.
My problem is, is the ammount of drills we are going through.
We are using Guhring tin plated drills to machine forged steel.
We have a drill grinding machine, but the reground drills are obviously not lasting anywhere near as long as the new drills, as we have no way of recoating the tip of the drill after regrinding.
What methods are available to us for recoating drills? Is there any specialist equipment available to anable us to recoat drills in-house?
Thank's for any help/tips.





RE: Reconditioning drills
Also look at when you are pulling the drills -- some times pulling them before they are totally "dead" will make a big difference in the regrind process.
good luck and happy grinding.
RE: Reconditioning drills
RE: Reconditioning drills
You might ask Guhring for hints about optimizing drill life.
They will ask you for such things as:
workpiece material
coolant
drill diameter
feedrate
drill rpm
You might also get more help here, given that same essential information.
Mike Halloran
Pembroke Pines, FL, USA
RE: Reconditioning drills
RE: Reconditioning drills
http://www.guhring.com/PS/Reconditioning.htm
RE: Reconditioning drills
here's a bit more info that may help...
we are using 10 and 12mmm dia TiN coated drills.
we are peck drilling forged chromium steel (46Cr2n) using coolant. Drill depth is upto 100mm deep.
we are running at 650rpm and 0.2mm/rev feed rate.
I've attached some photo's of a worn drill. Sorry the quality isn't good they were taken on my phone. hopefully you can make out the area of wear. The drills tend to wear out at the corners then rub and wear along the shaft.
I am still interested in the coating process if anyone can help?
Thank's again.
RE: Reconditioning drills
It might not be the answer but here are a few things to try.
First of there is no panacea for your problem. I Would get with a Guring Applications Engineer to discuss you problem.
As mentioned above checkout the geometry of available drills.
Test different coolants. This can make a lot of difference in a hurry. When they took Trichlorethylene + oil out of shop it took almost a year to find a coolant that would work,though not as good as Triclean and oil.
Make sure you are clearing the chips. A chip will push the bit sideways and cause excessive wear real quick.
Our peck is used on smaller drills than yours and we use a lower RPM and feed rate.
Checkout different coatings like those offered by Impreglon.
How many holes are you talking about?
Required quality of the hole?
Have you considered EDM or Carbide drills?
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RE: Reconditioning drills
RE: Reconditioning drills
Also you may want to try this type of drill bit from BA manufacturing.
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http://www.bamanufacturing.com/page_30b.htm