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radius sanding

#234427 by marcs4095 » Fri May 19, 2017 3:04 pm

In building a banjo I needed two 3x5" maple blocks sanded to an 11" radius.To do so, I first mounted a strap hinge 3/4" above the table to my rip fence with T-blocks and 1/4-20 bolts. With J&B Weld epoxy, I mounted a 1/4" shelf hanger bracket to the end of the hinge.
I next made a supporting frame with 1/4 hole for the bracket to engage. This frame supports the block upright to be sanded such that the center of the pivot is 5 1/2" (half the 11" diameter) from the face of the block. The block is then attached with 2-sided tape and the fence is adjusted such that the block is well supported by the edge of the table. (I don't trust the 2-sided tape that much!)
I just barely touch the face of the block to the sanding disk as to take off small increments at a time. I feed the block into the sanding disk against the motion of the disk; remove the block support and block from the hinge pin; bring it to the back; reassemble and repeat.See photo.
Last edited by marcs4095 on Fri May 19, 2017 3:16 pm, edited 2 times in total.

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Re: radius sanding

#234428 by marcs4095 » Fri May 19, 2017 3:07 pm

This jig is also handy for sanding various sized disks such as a table top. I have shown it here to illustrate the point. Of course, for larger table tops you will need to make a spacer between the hinge and the rip fence and likely need to use an auxiliary table for the rip fence. See attached photo.

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Re: radius sanding

#234437 by rjent » Fri May 19, 2017 9:06 pm

Don't see a picture.... :/ Would love to see how this works! :cool:



1951 10 ER S/N ER 44570 -- Reborn 9/16/14
1950 10 ER S/N ER 33479 Reborn July 2016
1950 10 ER S/N ER 39671
1951 jigsaw
1951 !0 ER #3 in rebuild
500, Jointer, Bsaw, Bsander
2014 Mark 7 W/Lift assist - 14 4" Jointer - DC3300
And a plethora of small stuff .....

"The trouble with quotes on the Internet is that you can never know if they are genuine." - Benjamin Franklin

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Re: radius sanding

#234442 by skou » Sat May 20, 2017 12:37 am

rjent wrote:Don't see a picture.... :/ Would love to see how this works! :cool:

Yeah. Two of us! :D



10 ER, stripped down.
Basic 10ER, Parts machine. Will be a semi-dedicated drill-press machine.
10 ER, a "survivor" of the trailer fire, in the back yard, needing restoration. Has a Mk5 headrest. Finally, stripped down.
Numerous parts, for Model 10 stuff. Except for lower saw guard, A and B adapters, I've got it.

Looking for one more, or some 9 inch extension table raisers.

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