advice on making circle formwork

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advice on making circle formwork

Postby jack9 » Fri Oct 17, 2014 10:39 pm

hello

i am cutting out a 72cm diameter circle using a jigsaw on 15mm laminated board

i am thinking of driving a nail in the center, tying 2 pcs of string to it, and then securing them to the top and bottom of a marker for marking the border.

is there a better diy jig that you have tried before

thank you
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Re: advice on making circle formwork

Postby sirineou » Sat Oct 18, 2014 5:09 am

jack9 wrote:hello

i am cutting out a 72cm diameter circle using a jigsaw on 15mm laminated board

i am thinking of driving a nail in the center, tying 2 pcs of string to it, and then securing them to the top and bottom of a marker for marking the border.

is there a better diy jig that you have tried before

thank you

Take a flat piece of wood about 100 cm long and as wide as the shoe of your jigshaw, a piece of plywood works good because it will not split.
on one end cut a slit wide enough for the blade of the jigshaw to go through.
attach the shoe of the jigshaw to the plywood with screws if it has holes, if it does not drill a couple of holes on the shoe.
Make sure the screws don't go all the way trough the plywood stick.
Then measure 72cm from the blade and drive a nail,
nail it in the center of your circle. It makes a perfect circular cut every time.
I am sorry I just realized you said 72cm diameter, so divide by two to get the radius.
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