Circular saw arbor problem

4570Man · Nov 13, 2020

I’d drill out the hole before attempting to grind the arbor. BTW 40 teeth on that diameter blade is still too many for that thickness material.

downsizingnow48 · Nov 14, 2020

I looked up that series of saws. All appear to have a 5/8 shaft and all except the 6460 have a 5/8 arbor. That suggests to me that the blade mounting flanges are interchangeable. I think if you got the flanges for the 8 1/4 saw, they would fit your saw perfectly and allow the use of current 10 1/4 blades.

BigBlue1 · Nov 14, 2020

downsizingnow48 said:
I looked up that series of saws. All appear to have a 5/8 shaft and all except the 6460 have a 5/8 arbor. That suggests to me that the blade mounting flanges are interchangeable. I think if you got the flanges for the 8 1/4 saw, they would fit your saw perfectly and allow the use of current 10 1/4 blades.

Interesting. Thanks for mentioning that. I can certainly look for the inner spindle washer from the 8 or 10" saw (the 6470). But I suppose if that is fine then my grinding idea should be OK too. I re-checked last night and the 5/8" blade arbor fits very snugly on the spindle. Seems like less play in that than the spindle washer itself, or at least no more.

Rob

JimRB · Nov 14, 2020

My guess is an engineer said it would be better for a slipping blade to spin on a 50 cent nut/washer than to spin and chew up an armature or output shaft that could cost $10-20. Wholesale prices of course. 5/8 to 3/4 you could easily fix if you spent a few thousand to get an old milling machine and some cutters.

BigBlue1 · Nov 14, 2020

JimRB said:
My guess is an engineer said it would be better for a slipping blade to spin on a 50 cent nut/washer than to spin and chew up an armature or output shaft that could cost $10-20. Wholesale prices of course. 5/8 to 3/4 you could easily fix if you spent a few thousand to get an old milling machine and some cutters.

If that's the case, they obviously revisited their decision since all these other Milwaukee saw models have a 5/8" spindle with non-flanged washers.

Even if true, this saw is not going to get anywhere near enough use for that to be a concern.

BigBlue1 · Nov 27, 2020

Just to follow this up...

After investigating the situation, inspecting several other circular saws I have, and finding that newer models use 5/8" arbor blades with flat spindle washers I went with the simple, cheap and effective fix. I ground off the flange on the inner spindle washer. The 5/8 arbor blades fit the spindle very snugly, just like other saws. The non-flanged washer is just like other saws. This saw has worked perfectly after the mod and allowed me to do a bunch of long rips of 3" thick hard maple slabs, which is the whole reason I needed this saw.

Thanks for the tips, especially downsizingnow for your comment about the other saws in the model line.

Rob

P.S. If anyone wants the two 3/4" arbor 10.25" blades I have which are no longer of use (both need sharpening) let me know.