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PostPosted: Wed Jun 18, 2014 4:15 pm 
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Walnut
Walnut

Joined: Tue May 12, 2009 10:08 pm
Posts: 23
First name: Glenn
City: Sydney
Country: Australia
Focus: Build
Status: Amateur
Had an idea bouncing around in my head for a couple of weeks now, wondering if anyone has attempted to use and angle grinder as a right angle arbor for fret slotting?

There would be a few things to think of like speed adjustment, fitting correctly to the cnc, arbor adapters to fit the blade.. etc..

Anyone seen anything like this or have experience with it?
Keen to give it a go as long as there isn't anything at a glance that may not make it feasible.

Cheers
Glenn


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PostPosted: Wed Jun 18, 2014 4:44 pm 
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Cocobolo
Cocobolo

Joined: Mon Mar 03, 2008 6:51 pm
Posts: 488
I've seen someone's setup like that. Benevente's I think.


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PostPosted: Wed Jun 18, 2014 5:19 pm 
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Contributing Member
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Joined: Mon Jan 28, 2013 8:29 pm
Posts: 113
First name: Rand
Last Name: Kennedy
State: CO
Focus: Build
Status: Semi-pro
I'd be worried about TIR at the blade edge. Angle grinders aren't really intended to be precision tools. Lotza work to get it mounted and aligned. Cool idea. I've been drooling at an HSD aggregate head that's been on Ebay for a while $$$$$. No way.


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PostPosted: Thu Jun 19, 2014 10:26 am 
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Cocobolo
Cocobolo

Joined: Tue Jun 30, 2009 3:20 pm
Posts: 456
Focus: Build
i've seen this done before but the results to me didn't demonstrate quality. as stated, spindle t.i.r and wobble is horrible on those things. then there's the compressor oil spitting out...

i'd probably make a head myself. years ago i designed and made a 90 milling head for a star cnc lathe to do slotting and it was easier then it looked. bevel gears, bearings, er collet spindle, and an aluminum housing. it was pretty cool.


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PostPosted: Thu Jun 19, 2014 7:37 pm 
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Cocobolo
Cocobolo
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Joined: Sun Jul 29, 2007 4:11 am
Posts: 115
Location: Canada
First name: Rick
Last Name: Hubka
City: Chemainus
State: BC
Zip/Postal Code: V0R 1K1
Country: Canada
Focus: Build
Status: Amateur
One of the fellows at the Joe's CNC forum did just that a few weeks ago and put the video on YouTube.
Here it is https://www.youtube.com/watch?v=UeK3Kkt5jvE#t=19.
He used a battery angle saw.
Watching it, all I can vision is a fret saw. Cool!!!

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Rick Hubka
Chemainus BC Canada


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PostPosted: Sun Jun 22, 2014 12:05 pm 
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Brazilian Rosewood
Brazilian Rosewood
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Joined: Tue May 02, 2006 9:02 am
Posts: 2351
Location: Canada
First name: Bob
Last Name: Garrish
City: Toronto
State: Ontario
Country: Canada
Status: Professional
For the effort, just get a small high speed spindle and mill them. Depending on your feed rate limitations, you can cut slots just as quickly, you can do blind slots to eliminate binding and end-filling, and you can cut inlay and other small items with the same spindle. Small electro-spindles that'll do 45-60K are are cheap now.

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Bob Garrish
Former Canonized Purveyor of Fine CNC Luthier Services


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