D-Bit Speeds and Feeds

[Mark SlatterParticipant @markslatter13251]

[Mark SlatterParticipant @markslatter13251]

Hi all,

Ive never had the need to use a D-bit until now and am quite proud of my first attempt at making one. We'll see if it actually cuts anything!

I'd appreciate some advice on speeds and feeds for this. It's a 6mm d-bit, the difficult bit is I'm using this on a CNC lathe and will therefore not have any "feel" as to how its cutting.

I was initially thinking 100rpm, and 0.05 mm/rev feed, with a 0.5mm peck to clear the chips and keep things cool. How does that sound?

I should add, the pilot diameter is 5.9mm and the material is EN9. 

Edited By Mark Slatter on 15/05/2021 11:07:13

[Anonymous]

Depends what material you're cutting. For brass I'd be running at 500rpm and 0.1mm/rev and I wouldn't peck. Essentially the D-bit is a single flute reamer. You want to go in and out in one smooth movement with no faffing about.

Andrew

[Mark SlatterParticipant @markslatter13251]

Thanks for the reply Andrew, the material being reamed is EN9. I'll get rid of the peck as you suggested.

[Anonymous]

Ok, I'd drop the speed to 250rpm and feed to 0.06mm per rev and use flood coolant.

Andrew

[Mark SlatterParticipant @markslatter13251]

Excellent, many thanks ill give that a try

[Author]

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