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Recommendations for a chatter free countersink?

I'm buying blade stiffeners from Lee Valley and want to buy something else..

I've had poor results with some contersinks. What works well and at what speed, for irregular grain, esp for BRIDGES?

I've seen ball mills, unibit step drills, single and multi flute countersinks.

I need smooth! But do I have to clamp every time I countersink?Terry Stowell38976.5212847222

Terry,
What are the dimensions of your holes, both pilot and countersinnk? They make comination drills.

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"An adventure is only an inconvenience rightly considered. An inconvenience is an adventure wrongly considered." G. K. Chesterton.

    I have found the single lip countersinks work the best. The multifaced cutting provides too much cutting surface which overcomes the rigidity of the drill press and chuck. The single-lip also tends to burnish the chamfer to some degree.

    In wood, I generally use a relatively high speed and light feed. This seems to prevent tearout, relatively well.

Billy DeanBilly T38976.6298726852

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Billy Dean Thomas
Covina, CA

"Multi famam, conscientiam, pauci verentur."
(Many fear their reputation, few their conscience)

Terry,
Get this ONE in a 3/8" size. It was recommended to me by a local luthier/repair guy. I have tested it, and it is totally chatter free with a hand drill!

Tracy

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Tracy
http://www.luthiersuppliers.com

Yup! What Tracy said. They work GREAT!

-Mark

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Pullman, WA

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Thanks. Just what I thought, just by the nature of the design, I thought it would work.

Yeah, those zero-flute sinks work really well. However, don't waste your time with the cheap imports. They'll just disappoint you by not being sharpened appropriately to begin with, and by dulling too quickly. Don't panic, though. Even the good ones in the sizes we use shouldn't cost more than ten bucks.

Yeah, I think I had one of the cheapies that dissappointed. I'm ordering some blade stiffeners from Lee Valley, and I'll get a couple other goodies too!


Thanks guys!

Thanks Tracy. I have been trying to remember where I saw them.

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Aoibeann

For bridges, I use a cone-shaped stone in a Dremel. No chance of tearout, and produces a lovely countersink. And the aroma of BRW smoke... ah....

I use the same cone(this Dremel is set aside with this stone in it all the time, I use it so much) for also esing the edges of the tuner holes, for the bushings, for the end pin, and for the bolt holes in the body. Anything that needs a slight chamfer....

Mario,
How do keep the stone from loading up?

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Jim Watts
http://jameswattsguitars.com

Shane, I use coarse, medium and fine.
Typically buy my my fret fret wire from LMI or Allied as I like it coiled. Will you be selling it staight or coiled? Jim_W38977.037349537

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Jim Watts
http://jameswattsguitars.com

How do keep the stone from loading up?

It doesn't load up. At least, not enough to affect it.

[QUOTE=ToddStock] Woodcraft used to carry Weldon[/QUOTE]
Reid Tool carries Weldon.

www.reidtool.com

Look under "cutting tools" for countersinks.

[QUOTE=Mario] For bridges, I use a cone-shaped stone in a Dremel. No chance of tearout, and produces a lovely countersink. And the aroma of BRW smoke... ah....

I use the same cone(this Dremel is set aside with this stone in it all the time, I use it so much) for also esing the edges of the tuner holes, for the bushings, for the end pin, and for the bolt holes in the body. Anything that needs a slight chamfer....[/QUOTE]

Thanks for the tip, Mario. Great idea.

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Todd Rose
Ithaca, NY

https://www.dreamingrosesecobnb.com/todds-art-music

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