Why do some horizontal mill arbors have key ways and some don't?

Shaybuilder · Jun 8, 2020

I have some B&S #11 arbors without keys and some B&S #9 with keys and some cat40 without keys, why don't they put key ways in all arbors? It is hell to get a 6" cutter tight on a 1 1/4" arbor so it won't slip without a key. Is it because they may warp?

Marty Feldman · Jun 8, 2020

I haven't seen a good explanation of why this is, and like most operators of the machines in question, have a clear preference for the solid lockon of cutters on arbors with the keyway. I think if I had to guess the answer would involve the additional cost of manufacturing an arbor with a keyway.

-Marty-

M.B. Naegle · Jun 8, 2020

Probably because not all cutters have key ways and it's cheaper to make arbors both ways then just having them all have keys. Lot of light duty home-made cutters and arbors are made without. I'd rather they all had them though.

My only other idea is that perhaps it used to be easier to grind key-less shafts so they went keyless when the chip-load was minimal but the tolerance was high? We actually have a long plain milling cutter without a key-way. It's got short teeth that kinda makes me think it was for finish cuts.

michiganbuck · Jun 8, 2020

Some/many arbors were intended for holding a cutter or other something for grinding, not for holding a mill cutter for milling.,

ChipSplitter · Jun 8, 2020

michiganbuck said:
Some/many arbors were intended for holding a cutter or other something for grinding, not for holding a mill cutter for milling.,

C'mon Buck, ya can't grind EVERYTHING.........

tnmgcarbide · Jun 8, 2020

a 6" cutter on an 1-1/4" arbor................
i think maybe that's where the question should be.
machines designed for such cuts have at least a 50 taper, but also the provision to bolt the facemill
directly to the outside of the spindle face .

leeko · Jun 8, 2020

tnmgcarbide said:
a 6" cutter on an 1-1/4" arbor................
i think maybe that's where the question should be.
machines designed for such cuts have at least a 50 taper, but also the provision to bolt the facemill
directly to the outside of the spindle face .

I'm a little confused by this comment - the OP appears to be talking about arbor-mounted horizontal mill cutters, I don't think there was any mention of facemills. Or am I missing something?

Not trying to be difficult - just curious

Lee

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Why do some horizontal mill arbors have key ways and some don't?

Shaybuilder

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Marty Feldman

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M.B. Naegle

Diamond

michiganbuck

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ChipSplitter

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tnmgcarbide

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leeko

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