Annular cutters
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- Posts: 187
- Joined: Tue Dec 04, 2007 11:00 am
- Location: Ivins, Utah
Re: Annular cutters
Quality annular cutters, properly held, will make a very accurate hole. No need to start with 1-7/8 and bore unless you need a tolerance measured in single-digit thousandths. Hand-held drill, no. Gooddrill press or mill, yes.
Re: Annular cutters
Just figure out how those blind holes were drilled in granite in ancient ruins in modern Egypt!
Then replicate...
RussN
Then replicate...
RussN
Re: Annular cutters
I guess it would depend on the size holes with step drilling, or did you mean using a
step drill on thin materials ?
Annular cutters give you round very clean accurately sized holes, quickly but at a price.
Just had to do some light deburring of the sharp edge on that prop elevator call button
panel I posted previously.
The baby versions of them are Blair Rotabroach, excellent for sheet metal.
The kerf on the annular cutters are pretty big, random measuring of the few I have
are about .1940" so if you have tubes that have that wall thickness it's a perfect match.
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- Posts: 1852
- Joined: Tue Dec 06, 2016 4:05 pm
- Location: Elmwood, Wisconsin
Re: Annular cutters
if your tube wall is thicker than that you could use an annular cutter to save time by roughing with an annular cutter and finishing with an end mill. That's a rather esoteric application, though. I can't think of any reason to design such a feature, other than to make machinists hate you.
Re: Annular cutters
Rota broaches make excellent end mills, laying up a ship in Indonesia I was running low on sharp end mills but had heaps of rota broaches, they worked well on removing metal on the mill.