Feast your eyes on the exploded diagram of the Logan cross slide (LA-747) and the pivoting part of the compound slide (LA-746). Of particular interest to our proceedings today is the pin (LA-744). There are two, one each side.
While I have some time today, I'm gonna get some idea of what the pins need to look like. I gotta make two to replace the two I murdered trying to remove them.
The plug on the bottom of the pivoting part has a complementary angle for the plug to push against, effectively locking it into place. Logan calls part LA-746 the swivel.
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| Part 19 - bottom view |
Angles on the ends, length and diameter of the old pins.
60° ends
Length is 28/32" = 7/8" = 0.875"
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| Caution! PARALLAX ERROR!!!! |
Diameter is 0.252" in a 5/16 - 18 tapped hole. Tap drill size is F or 0.257" leaving 0.005" clearance.
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| Uh... no, I won't make it that big again |
After these are made, there will be a bit of fitting to make sure they work right. Then assembly to see what else I need to make to finish up the taper attachment. Hooooboy, this is getting exciting.
Can you make a brass button for the end of the pin where it jams into the taper?
ReplyDeleteIt would be sacrificial, softer and grab better.
Just a thought. Otherwise you could probably just go buy a couple of hardened pins and grind down the ends.
Now that you mention it, I have some brass rod I could make the tips out of... Hmmmmm..... I really want the tips to come out with the set screws that hold them in. I don't like that they float with no way to retract. But they didn't need to be removed in 80 years, so I may just be over thinking it.
DeleteGo to about 6;20 in this video and you will see what I'm talking about with the brass buttons.
ReplyDeleteThis guy modified his Mini lathe.
https://youtu.be/o_B8LTvDR3o