Machining lugs

Machining lugs

This topic has 5 replies, 4 voices, and was last updated 18 April 2011 at 22:04 by mgj.

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18 April 2011 at 18:11 #67090
Rich2502
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@rich2502
How do you machine a round bar with a sqare key, or lug on it ?

I have a mill / lathe set up.
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18 April 2011 at 18:11 #21848
Rich2502
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@rich2502
18 April 2011 at 19:56 #67094
John Coates
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@johncoates48577
Make a square jig to sit the round bar in, clamp to milling table then turn through 90 degrees to mill each face of the lug and then face the end?
18 April 2011 at 20:25 #67098
Dusty
Participant
@dusty
Richard, with great difficulty with the equipment you appear to have. I would turn the dia of the bar to size and then on the milling machine cut a keyway into the bar to whatever length and width you require. Now make up a key to fit the keyway, this can be fixed into the keyway with socket head cap screws (allen screws) with the heads lost in the key.
18 April 2011 at 21:03 #67100
John Coates
Participant
@johncoates48577
Ahh

I thought the lug was on the end of the bar, not in the middle

D’oh!
18 April 2011 at 22:04 #67104
mgj
Participant
@mgj
Or you can use a bit of round with a square milled on the end. Raise a coupe of burrs to hold it correctly in its hole and silver solder. Best if the socket isn’t a through hole, though that may not matter..

If the lug is on the end thin I’d mill a slot across the end and silver solder the appropriate bit of square in.

Or you can machine a length of bar with a ring on it and do it in several passes under hte mill with a dividing head – thats less elegant, because you then have to skin the final little facets off with a dividing head too.

If its a long slot(s) you can just mill the slots and loctite the bit of “spline” in , which is fine since the thrust is taken on the sides of the slot. If the machining is good and tight to width, the Loctite merely locates.
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