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I made mine with the factory edge of an mdf sheet. I didn't consider if it would be straight or not. Maybe I should have... but all my cuts using it have been good.
What are you using to check the edges straightness, you sure it's straight?
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Get some UHMW sheeting; really slippery, heavy plastic that is often used for guides.
Hovis
withered_preacher
@NotThamesWater
I need to make a sheet ripping guide for a circular saw - I made one from MDF, but the edge of the MDF is not straight, even through it's uncut.
I'm thinking of bolting a 1" box section aluminium tube as a fence - is that going to be straight, or are even machine metal things a bit bendy?