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Old 11-11-2019, 04:32 PM
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Default Adapter machining

I've been thinking and planning a future build, or more like deciding what parts to buy, but I've hit a bump in the road. I'm planning on machining an adapter so I can run a SBC flywheel off a 1" pto. I will be getting a lathe soon, so I will be able to machine the adapter, and they have a drill press at work I can use to drill the necessary holes. But the one thing that I'm not sure how to do is cut the 1/4" keyway. Does anyone have any advice on how to cut one? And should I make it out of regular bar stock, or aluminum, or something else? It will need to be able to handle 30 horsepower.
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Old 11-11-2019, 07:56 PM
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Buy a weld on hub, machine a flange out of plate/ or get a weld on sprocket(modify that as a flange to fit the flywheel), to fit hub...weld it on...
No cutting keyway, also itll fit the shaft without needing drilling/reaming.. alot less work...
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Old 11-11-2019, 08:32 PM
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I'm not sure that I'm comfortable welding something onto a crankshaft, I could see that making it hard to access the internals for rebuilds or fixes. I did just remember that on my last order gopowersports had a mixup and sent me a 60t instead of the 48t I was supposed to get. One phone call and a few days later I get the 48t, but they let me keep the 60t, which has a 1" bore and 1/4" keyway. The question now is would a 1 inch piece of 1/4" key be able to handle 30 ish horsepower and the torque that comes with it reliably? Keep in mind I'm hoping this thing won't weigh any more than 750 lbs.
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Old 11-11-2019, 10:53 PM
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No.. no welding onto the crankshaft.. Thats why I said get a weld on hub.
In all of my sprockets on my bike.. They are of this verity..
It allows you to custom tailor a sprocket and shaft size accordingly...
And Yes.. a 1" shaft hub will more handle more than you can throw at it, in this case..

Here is one on the amazon.. From G and G manufacturing....(common here as thats what the Princess Auto(our HF tools) has for the driveline products in Canada).

https://www.amazon.com/008-6016-Weld...3534083&sr=8-2

Equally speaking that sprocket would probably do nicely...

So what exactly are you trying to do anyways???...
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Old 11-12-2019, 06:38 AM
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cutting the keyway isn't too hard to do I guess..

a matching keyed shaft and a few inches of keystock are easy to get,
file the keystock to a tapered coarse sawtooth pattern to make yourself a broach,
harden and sharpen the teeth, ..
put it in the shaft, and push it through with a shop press

you might need a few such saw-keys increasing in height to make it easier,
or one shallow one and shims to raise it in the keyway

'sid

PS well you can also just buy a broach I guess
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Old 11-12-2019, 06:41 AM
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I won't say much about the entire build, but I will tell you what the adapter is for. I am planning on running an automotive manual clutch off a mildly built (cam, rods, flywheel, springs, alternator) predator 670, so I can use a four speed manual, a very shortened drive shaft, and a shortened automotive axle. And I am planning on building something that bolts to the side-plate mounting holes that will act like a bearing carrier so that I can add a thrust bearing between the adapter and the engine. That should keep the majority of the clutch pressure off the sides of the crank.

Uh, yeah, I don't have a shop press, and the one they have at work is a 20 ton hydraulic that only likes crushing things. So I think I'll use the sprocket. Other than that they do have a heat treat building for hardening steel.
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