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Thread: Make a taper pin?
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19th March 2010, 08:06 PM #1
Product designer retired
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Make a taper pin?
In order to finish off my Hercus quick change gearbox, I need a tapered pin.
It will be imperial, so will have a taper of 1 in 48. Drawn up with Autocad, the included angle measures 1.2 degrees, or 0.6 degrees each side of centre.
I can purchase tapered pins, but from Heidelberg to Glastone Park, is a two cut lunch trip, so, can I make one? Mild steel will be sufficient, little strength is required.
I have a Unimat 3 lathe, which has a taper turning attachment and a fixed steady.
What are my chances?
Ken
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19th March 2010 08:06 PM # ADSGoogle Adsense Advertisement
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19th March 2010, 08:12 PM #2
Pink 10EE owner
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Simple thing to make, use the top slide...
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20th March 2010, 12:59 AM #3
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I munched a cheap dial indicator between my carriage and headstock and broke the taper pin on my power feed (I know, I know, I can hear you guys giggling all the way over here).
The taper pin was a short little thing, about 1.5" long. I didn't want to go through the calculations to figure out the taper so I just made a new taper pin that had a small end and large end that matched the original. I made mine out of brass in about 5 minutes using a file. I didn't use the cross slide (although I could have), but the file seemed to work fine for me. Since it was brass any small margin of error was no problem and the pin tapped in place just fine.
Try to match your new taper pin to the material of the old one. I wouldn't make it steel if the original was brass. In my case the original was brass because it was designed to be the weak link and break if anything bound up (it worked perfectly!). If I made a replacement out of steel it might no longer be the weak link.
Just a few thoughts.
Good Luck!
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20th March 2010, 02:52 PM #4Dave J Guest
Dosn't matter how much experienced someone has, they will all make a mistake sometime or another. Lucky for you that was all that happened, and the shear pin was there to save any further damage.
Originally Posted by tyleryoungblood
Ken,
Like RC said, I would just use the compound for something like that.
Dave
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24th March 2010, 06:36 PM #5
Product designer retired
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Tapered pin, done & dusted. Took me 3 attempts to get the taper right.
Turned it up on my Unimat 3 using the taper turning attachment.
Old nails make good pins.
The gearbox is now fully assembled, and wrapped in tissue paper waiting for the final build.
Ken
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