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.
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.
Art shot of the underneath.
Super cheap digital circle routing.
Super cheap digital circle routing.
Martyn
The glass is half full... but I'll have another while your up!
It's not over until Ricky Pontin cries! (Not long now).
Great minds like a think!
The glass is half full... but I'll have another while your up!
It's not over until Ricky Pontin cries! (Not long now).
Great minds like a think!
- charangohabsburg
- Blackwood
- Posts: 1818
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Re: Super cheap digital circle routing.
Great "drawer slide" source.
Markus
To be stupid is like to be dead. Oneself will not be aware of it.
It's only the others who suffer.
To be stupid is like to be dead. Oneself will not be aware of it.
It's only the others who suffer.
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