Precision Testing: How to Check the Accuracy of 45-Degree Combination Squares 

Cheers Mike, Yes a marking knife is a good idea, I am going to recheck my Starrett and the triangle.

lol, thanks for that.

Thank you

Yes, I am going to run that test again with more accuracy and work out what the actual deviation is. Then I’ll give him a ping and check the tolerance.

Thank you for the comment, I don’t have access to the iGauge tools. Sorry :-(

Cheers Kyle, i don’t have the 45 only the 90’s. It may be a good addition though, I’ll see what’s left in the budget :-) Cheers Andy

Yes the marker was a compromise so the video would pick it up, I think I said that on the video. I am going to re-run that test but use my marking knife instead of a pencil. Then I can use more complex maths to calculate the variance. I was very surprised by the Sterat and the BD triangle.

Thank you, I started using the 0.5 when I purchased the Incra rules (the hole is 0.5) but now I have the Benchdogs ones, I will indeed switch to the 0.9 Cheers Andy