Super cheap digital circle routing.

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Tonxi
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Joined: Mon Apr 11, 2011 10:36 am
Location: 55km SE Glen Innes NSW

Super cheap digital circle routing.

Post by Tonxi » Fri Jul 29, 2011 5:11 pm

In a quest for accurate circles I came up with this easy and cheap option.
$99 laminate trimmer, $10.99 digital calipers from Hong Kong and some scraps of 3mm perspex.
I took the screws out of the end of the digital calipers and gradually drilled it out to 3/16"
I took the base of the laminate trimmer apart and made a new base from 3 thicknesses of 3mm perspex with a nice snug slot for my digital calipers to fit in.
I drilled and tapped a hole and reinforced it with a nut for my locking mechanism.
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I chose a radius close to what I needed. my slot stops roughly 20mm from my bit center so I added 20mm more.
Push into the slot and lock in place. Engage the pin and cut a circle to use for calibration. My idea was to file or shim the end of the slot to 20mm from the center of the bit but when I measured my test circle the 20mm gave me the exact 76.2mm inner diameter that I need with a 3/32 bit in so I am going to leave well alone.
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Art shot of the underneath.
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DSCF3236.JPG (135.66 KiB) Viewed 6689 times
:gui
Martyn

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charangohabsburg
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Joined: Sat Oct 16, 2010 1:25 am
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Re: Super cheap digital circle routing.

Post by charangohabsburg » Fri Jul 29, 2011 9:10 pm

Great "drawer slide" source. :cl
Markus

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It's only the others who suffer.

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