Angle Plates Project, need help on navigating the angles

looks interesting mike. honestly, i was going to scribe a line where the hypotenuse was then mill it down to near there. then, I was going to measure it like this....using my calipers to measure the length of side 1 and 2. once those are right, the hypotenuse length should be correct...am i wrong?

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Accuracy isn't crucial at this point because we will be grinding them after they get back from heat treatment. We need to leave about .015 on each side so I think that is easy enough. The corner won't be that sharp, I think it will work.
 
A 6" vise is overkill for a RF45 style mill. A 4" is more appropiate for that size mill & IMO 5" max. I have a 5" GMT vise on my PM45 & it's slightly too big. Not enough Y axis travel to make use of the 5" full capacity. Better to save your money rather than getting something too big & most importantly the weight. I take my vise of the table quite often, a 6" is still light enough for me to be carried by hand but I'm glad I have a 5". I also have a 4" vise as well. I prefer the 5" though.

But those GMT 6" Premium vises are pretty nice. I'd love to have one but don't need one on my current mill. But if you plan on upgrading to a full size knee mill in the future than the 6" will be perfect.


Here's what the 5" looks like on my mill.
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I couldn't even complete this cut without my bellows & DRO scale getting in the way. Not enough Y travel & the 5" vise is not even maxed out.
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Here's what a 6" vise looks like on another PM45 (gt40's)
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Don't you guys have angle plates in your shop? Simple enough to use them to set up the angles in your milling vise. Angle plates will be more than accurate enough to get within 0.02 degrees.
 
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