production drilling question?

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Forum topic by triw posted 06-14-2012 09:17 PM 793 views 0 times favorited 4 replies Add to Favorites Watch
View triw's profile


36 posts in 1727 days

06-14-2012 09:17 PM

I recently received an order for 100 pens made out of mullberry. I was drilling the blanks (new 27/64 drill bit) after about 10 to 15 I could feel the blanks getting very warm and the bit was hot. I drill on my lathe and drill in about 3/4” and back out. Any good ways to keep my drill bit from losing it cool?

4 replies so far

View ajosephg's profile


1878 posts in 2980 days

#1 posted 06-14-2012 09:32 PM

1. Back out more frequently, like 1/4 to 3/8.

2. Rig up a nozzle to blow continuous compressed air on the drill bit and pause for 10-15 seconds every time you back out, to further let it cool off.

-- Joe

View PurpLev's profile


8523 posts in 3067 days

#2 posted 06-14-2012 09:39 PM

for high production you might also want to look into HSS or better yet Cobalt drill bit which can run at higher temperatures without losing it’s edge.


Also, at what speed are you drilling? you might want to consider reducing it to induce less friction heat to the process as well.

-- ㊍ When in doubt - There is no doubt - Go the safer route.

View Gshepherd's profile


1727 posts in 1620 days

#3 posted 06-15-2012 08:46 AM

Heat buildup will kill any sharp edge. Slow it down some like purp mentioned. Guys all day long can drill through steel and with the right feed rate and speed and a little oil will preserve the bit. The wood will actually cool the bit if it is not fed to fast and correct speed and back out more often to clean the chips out…..

-- What we do in life will Echo through Eternity........

View waho6o9's profile


7115 posts in 1995 days

#4 posted 06-15-2012 11:49 AM

+1 for PurpLev, Cobalt totally rocks, use machine grade cobalt bits and you’ll be fine.

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