Tubal Cain 5.14

[Russell FurzerParticipant @russellfurzer50760]

In the ME Handbook, pg 5.14 there is a pair of tables for 4 and 2 flute cutters.

the 'tooth load' of (for eg a 3/8) slot drill is higher than for and endmill – is the table right?

[Russell FurzerParticipant @russellfurzer50760]

[Brian WoodParticipant @brianwood45127]

Hello Russell,

I had hoped someone else would have attempted to answer your question. the author died a number of years ago. I could do little more than use the examples Tubal Cain hinself has worked out in the table to cross check the tooth load value you query.

Using that approach, the tooth load should be divided by 300, not 1000, to give the same results,

I hope that helps you

Brian Wood

[Russell FurzerParticipant @russellfurzer50760]

Thanks for the reply Brian

I must be a bit dim, but can't work out where 300 and 1000 come from.

The cutting surface speeds ( I looked at 3/8 and 5/8) works out to be 62.83fpm for 4 flutes, 100 for 2 flutes at both dia.

If Tooth Load = Feed Rate/ (RPM x No teeth) then the TLs are double for the 2 flute (.001" vs .002 for 3/8, .002 vs .004 for 5/8) .

I presume that a factor of 2 is not an issue for the home workshop. The figures seem to work out ok for me when I blindly use them. Better not to think too hard i suppose

[Brian WoodParticipant @brianwood45127]

Hello Russell,

Not dim at all, I have no idea either!!

I would be inclined to use things as you are doing without getting overly concerned about the mathematics! After all, it is what gives you the right, or perhaps more accurately, acceptable result that is what matters at the end of the day.

Regards Brian

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