Sharpening HSS twist drills (for metal) to use in plywood

Bruce Griffing · Jan 16, 2018

OK - I sharpen my own metalworking drills - no problem. Normally I do a 135 degree split point. So what is the best way (point geometry) to sharpen said drills for use in plywood? This will be used in a CNC router.

Scruffy887 · Jan 16, 2018

Bruce Griffing said:
OK - I sharpen my own metalworking drills - no problem. Normally I do a 135 degree split point. So what is the best way (point geometry) to sharpen said drills for use in plywood? This will be used in a CNC router.

Brad point for a clean hole on the top. Good on the bottom if the sheet is sucked down to a spoilboard. And you can program a slower break through. Glue in the plywood will have its way with steel bits though. Carbide brad point bits are really not that expensive. And guessing under .5" holes?
Years ago I did a job that needed 20,000 holes in 3/4 mdf. Single bit did the job.

Tony Quiring · Jan 16, 2018

Brad point combined with slow breakthrough.

Just go ogled brad point and found this interesting thing that might be good...no connection just found it.

Boring Bits - Toolstoday.com- Industrial quality tooling for boring machines

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Sharpening HSS twist drills (for metal) to use in plywood

Bruce Griffing

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Scruffy887

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Tony Quiring

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