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Rule of Thumb.

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Mjay:
Now does that speed rule of thumb used for hss , carbide or both?

I enjoyed the pics  :beer:

Stilldrillin:

--- Quote from: Mjay on January 16, 2009, 12:04:26 AM ---Now does that speed rule of thumb used for hss , carbide or both?

I enjoyed the pics  :beer:
--- End quote ---

Thanks Stew, & Mjay!

The rule of thumb is for HSS drills, cutting quality engineering steels.
Faster, or slower to suit conditions......

Carbide drills, up to 25mm., I ran approx twice those rpm.

Carbide cutters...... I ran 50mm. at 900 -  1,000rpm. Pro rata for other sizes........


I`ve just remembered.  :scratch:
That second rock bit, with the inserts.......

We were supplying a driller who was contracted to drill 4,000 holes...... In Hong Kong.

Wondered if he was trying to sink the island.......

HS93:
How about a RPM for drills & milling cutters, machining brass alloy, I know i woul appreatiate one .

Peter

bogstandard:
Peter,

I don't want to step on Dave's toes, but I think you are asking 'how long is a piece of string' with that one, and almost no-one could keep that much info brainstored, as there are too many variables.

So here is a quickie link that gives a short explanation of a few of the variables and answers most of your question.

http://maelabs.ucsd.edu/mae_ms/feeds_speeds.html

But if you want to do a bit more research on it, type in 'machine feeds and speeds' into your favourite search engine.
In fact over the years, I have seen a lot of charts that can be downloaded or screengrabbed, then just get them printed up and laminated and keep them handy in your shop.

A lot of it is really down to experience plus a bit of trial and error.

Hope this helps.

John

Stilldrillin:
Spot on, John!  :clap:

Thank you  :thumbup:

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