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I'd like to have a bit that cuts rabbets with a very, very small radius instead of a sharp corner. Picture an upcut spiral bit with a very small radius, maybe 1/32, on the edges of the flutes.
Aside from grind-yer-own, is there such a thing?
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Aram, always learning
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a 1/32" roundover at the top with a straight rabbet profile?
get your sanding block out, you have the rabbet bit already
There are two issues that you would have to overcome: first is the small radius you propose, the second is how long is the straight portion of the rabbet gong to be. It would not work real well to have a radius say 1/2" above the straight portion of the bit and only need a 3/8" deep rabbet.
Additionally, even if it was made it would have a larger profile radius than 1/32" more like 1/16" or more. Not many grind a cutter with less than that and those are hard to come by
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It sounds like you are describing a
rounded edge end mill. John
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JGrout said:
a 1/32" roundover at the top with a straight rabbet profile?
get your sanding block out, you have the rabbet bit already
There are two issues that you would have to overcome: first is the small radius you propose, the second is how long is the straight portion of the rabbet gong to be. It would not work real well to have a radius say 1/2" above the straight portion of the bit and only need a 3/8" deep rabbet.
Additionally, even if it was made it would have a larger profile radius than 1/32" more like 1/16" or more. Not many grind a cutter with less than that and those are hard to come by
Fair enough. 1/32 is a made up value, just meaning a small radius to soften the transition. I'm not sure I see why the length of straight cutter used would matter, aside from the radius taking an appreciable fraction of the rabbet depth...?
Best,
Aram, always learning
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jteneyck said:
It sounds like you are describing a rounded edge end mill.
John
w00t!
That could do it. And I love McMaster's 5-minute delivery service. Complete the order, walk downstairs, receive package at door. Or so it seems.
Best,
Aram, always learning
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I considered the question and concluded you wanted an all in one pass cutter
the reason for that conclusion was that I used to mill exterior door frame rabbets in a similar fashion but used a stack of knives( one straight and one radius on top) on the shaper to accomplish both cuts at once
there is a limiting factor when doing the same with a router bit unless the shank can utilize different thickness straight cutters..
Let us not seek the Republican Answer , or the Democratic answer. Let us not seek to fix the blame for the past. Let us accept our own responsibility for the future John F. Kennedy
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JGrout said:
I considered the question and concluded you wanted an all in one pass cutter
the reason for that conclusion was that I used to mill exterior door frame rabbets in a similar fashion but used a stack of knives( one straight and one radius on top) on the shaper to accomplish both cuts at once
there is a limiting factor when doing the same with a router bit unless the shank can utilize different thickness straight cutters..
Ah. Got it. I'm ok taking multiple passes. And the rabbets will not be large.
Best,
Aram, always learning
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I ordered some stuff from McM. Carr yesterday AM and it was at my door before 10 AM today. I also bought a new sprayer from Jeff Jewitt yesterday and it came at the same time. Amazing service considering how busy the delivery companies are right now.
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