Deep hole drill profile question

Oct 21, 2003 3 Replies
K

I need to do a lot of deep holes in UHMW material. Generally, these holes are 5/16" dia (loose tolerance) by 6" deep...sometimes deeper.



Using standard style long drill bits works ok..but there is a lot of pecking and the stringy chips tend to bind etc. I was wondering if anyone out there had any ideas for speeding up this process? Also, UHMW tends to dull bits fairly quickly. It's not terrible and 5/16" drills are easy to re-sharpen..but it would be nice to reduce this a bit. Carbide tips hold up ok, but it's hard to get the nice sharpness that UHMW likes to see when using carbide material.


Thanks for any ideas


Koz



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M

Agreed. Also, UHMW is self lubricating, which is good, however, you are likely generating a fair amount of heat. Likely that is a big factor in the short life of your cutting tool. If you can flood with coolant, use a spray mist, or an air blast will help alot. TiNi coated drills will be effective, as that is a coating with excellent resistance to heat.

michael

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B

Drill slower and more pressure to bring the chipload up. High speed is killing off the sharpness and the thin swarf is making the drill cut more material.

-- Bob May Losing weight is easy! If you ever want to lose weight, eat and drink less. Works evevery time it is tried!

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