trying to cut unknown angle accuratly

[paulmars]

I need to cut off both ends of two 4x4s at slightly over or under 90°

I've looked online and can't find any videos showing how to do.

I have a chop saw, but do'nt know how to line up the blade to the line on the 4x4. The line is straight , but not 90°

tks,
pa

[elanjacobs]

Set the angle by eye and test on the waste side of the cut, adjust as needed then cut on your line.

[paulmars]

wow. i had previously though of that, but would have to cut close to the line to be able to judge if it's right. So, then I might run out of scrap side before I got it set. However, as I read your post, I thought of cutting on a scrap 4x4 then overlaying it on top of the 4x4 with the line to see how close, then adjust and try again. Cool!

tks.

[Jigsaw]

Once you have the angle of the saw set correctly by cutting and checking your scrap pieces, then I would put a stop block on your fence on the end not being cut.
Put your real piece of timber against the stop block and make your cut on the waist side of the line. If you need to a smidjin more off, don't move the stop block just put a piece of cardboard (business card) or something between the stop block and end of piece and make another cut. If you need to get closer add another business card. Once you get it right, you can use the same business cards and stop block setting to cut extra pieces.

[derekcohen]

I need to cut off both ends of two 4x4s at slightly over or under 90°

I've looked online and can't find any videos showing how to do.

I have a chop saw, but do'nt know how to line up the blade to the line on the 4x4. The line is straight , but not 90°

tks,
pa

Pa, that is what a sliding bevel is for! :)

Set the sliding bevel by placing it against the master angle. Transfer this to the piece to be cut. Now cut along the line. Done.

http://www.inthewoodshop.com/Furniture/MovingForward_html_61efb7c1.jpg


Regards from Perth

Derek

[truckjohn]

I cut unknown angles all the time. Some of them are even variable....
;) ;)

[dr4g0nfly]

Have you got a roofing square? You could try this (http://www.thisiscarpentry.com/2011/07/29/miter-angles-miter-saws/)

[paulmars]

Trial and error on a piece of scrap. Done!

[truckjohn]

This video is my inspiration for cutting unknown angles with ease. ;)


http://www.youtube.com/watch?v=dB0MBGiX8TQ

[Mnb]

Beautiful

[ProTooling]

I seriously love that magic square... :)

[AlexS]

Trial and error on a piece of scrap. Done!

Not trial & error, successive approximations. Or if you're a mathematician, Newton's method.