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Unread 04-01-2005, 17:10
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Re: pic: Shifting Mechanism 222

I'm assuming that whoever machined that part either used a horizontal swiss type cnc lathe, or a 3 axis vertical milling machine with an A axis mounted table. also a part like that doesn't have an extremely hight tolerance space, I'm used to alot more, where the part has to be within 300 thousands of the original, but nonetheless it is a precision part. I'm curious of whether the main part of the internal shaft, is that created of a single piece of material?, or is a couple threaded together?
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Unread 04-01-2005, 17:18
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Re: pic: Shifting Mechanism 222

Nope, we used regular lathe and a 3 axis mill with a digital readout!

All we have at the school to used that is computer controlled mill. The thing is that we do not really know much about how to use it. We did make some simple gears and plates on it last year though.

I can make parts, but I would hate to mess something up that we or I spent hours machining, therefore I let the more experienced machinest make it!

The shaft pictured above is all one piece. It is A2 tool steel.

The main problem was that after machining it the dimensions changed after being hardened.
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Unread 04-01-2005, 17:24
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Re: pic: Shifting Mechanism 222

The dimension change is inevitable with a hardening process. And don't worry about messing up part, last year i made axles out of aluminum bars by milling the key slot with my max NC cnc milling machine and when i was setting it up i adjusted for the width of the material, but forgot to adjust for the width of the endmill so they didn't fit into the sprockets .
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Unread 04-01-2005, 17:50
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Re: pic: Shifting Mechanism 222

Did you find it was really neccesary to use tool steel (that must have been fun to machine...) and harden it? Was there enough wear to warrant it?
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Unread 05-01-2005, 18:01
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Re: pic: Shifting Mechanism 222

You could probably get by a season without hardening the shaft, but since we have not tested doing so I could not tell you what the results would be.

Here are the measurements I got from the gears; I do not have the shaft measurements for between each gear.

Third Gear:
1.014''

Second Gear:
1.001''

First Gear:
1.001''

Being that we used second gear the most it had the least amount of wear because it was not able to "freewheel'' on the shaft.

Overall the shaft was at 1.008'' in diameter, I am not sure of what it was when it was after being machined.
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