I have a length of 3/4 keyed shaft I was going thinking of running in bushings
any thoughts on if the key slot will tear up the bushings?
im expecting 50-200lbs on the axle, 4 bushings each an inch long of a hard plastic
I can tack in a key and turn it down for bearing spots but seems overkill
Yes, bears do shit in the woods. Or pretty much anyplace else they see fit. Who would presume to interfere?
Underkill, not overkill.
I use hand-trucks not so different with Oilite Bronze and don't expect forever-life. "Hard plastic" may have a short life, regardless @ 200 lbs?
"Place" a key, turn it flush.. and then.. the
wise also hard-SLEEVE the buggers.
You know the ones. Uber-finely finished surface. Hardened. Sold for instant bearing fits when doing shaft repairs. Not cheap, either, sadly.
Which is exactly what you need if a "plain" bearing is going to have a life. You WILL still need that keyway filled, though. Cheat on that, learn a second lesson.
First lesson being why it can be
cheaper to use plain shafting and only cut a keyway where it needs to be! Sometimes not at all?
Otherwise, "per earlier advice".. Chinee pillow-blocks with tolerable-decent AND "self aligning" roller bearings WITH decent eccentric shaft locks can be had for under ten bucks?
Here's a pair, US shipper:
UCP24-12 Pillow Block Bearing 3/4" Bore 2 Bolt Solid Base (2PCS) 7997894638 | eBay
Cheaper yet, you take four at a go. Under $20. Five bucks each?
I'd not mess with making anything but a couple of bolt-holes, meself.
And did not, last go. 1 1/2" Thompson shaft, full-length keyed, as-had. Two pillow blocks. No problem. Didn't really justify Swiss or German made ones, etc.