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| mini-lathe leadscrew clutch? |
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| chipenter:
My Faircut lathe had a dog clutch just a slieve with a keyway and two keys on the split lead screw , I made a micrometer knock off , have a look at lathes co uk for pictures . |
| tomrux:
from the description in the referenced thread from ME all that is going on is dropping the banjo in and out of mesh without the need to be twiddling spanners. Instead replacing a tight bolt with spring friction. Don't know that I would trust it not to drop out at the most inconvenient moment. Tom R |
| MetalMuncher:
--- Quote from: drmico60 on April 26, 2014, 10:39:34 AM ---Hi Metal Muncher, I have redesigned the change gear bracket and replaced this with a more conventional banjo, see http://mikesworkshop.weebly.com/new-threading-banjo.html This new banjo can be easily swung away from the drive gear and this enable the leadscrew handwheel to be turned easily even with the change gears mounted. I have taken this concept a step further and fitted a separate variable speed leadscrew motor to the lathe, see http://mikesworkshop.weebly.com/leadscrew-motor.html The banjo can be swung between the lathe spindle gear (for gear cutting and fine feed) to the variable speed leadscrew motor (for variable speed leadscrew feed). In between these two position the banjo does not engage with either and the handwheel can be used. I also have an autostop coupled to the variable speed motor for cutting to shoulders, see: http://mikesworkshop.weebly.com/autostop.html The autostop can also control the main lathe motor for high speed gear cutting, see: http://mikesworkshop.weebly.com/lathe-motor-control.html It would be easy to modify the banjo so that it could be swung by a lever that passed through a opening in the change gear cover. Mike --- End quote --- Very nice! Now I understand the "banjo" nickname for this device. Your autostop mod looks interesting too. But why do you have it made so you have to choose between auto stop and using the DRO? Is there no way to use them concurrently? A later post by Tomrux poses a valid concern about things moving out of mesh at the least desirable moment. But I am thinking there must be a way to fit a control lever to the banjo which would have some sort of positive detent arrangement, like the reverse lever on the back of a mini-lathe, so the banjo position would be safely constrained. Maybe even similar to some of the pro lathe controls which protrude from a curved surface, and have a spring loaded knob that is more flat than the shaft used for reversal on thep lathe. |
| MetalMuncher:
--- Quote from: garym on April 26, 2014, 12:50:55 PM --- --- Quote from: MetalMuncher on April 26, 2014, 10:23:07 AM ---..... I will try to reach the member who originally posted that information......... --- End quote --- The member who posted it "Stub Mandrel" was a pseudonym used by the present editor of MEW, Neil Wyatt before he was the editor and he'll probably reply when he sees the posts. Gary --- End quote --- Thanks Gary. |
| MetalMuncher:
Thanks DavidA and Chipenter, for the dog clutch info. The slotted sleeve and cross pin is how the Micromark power feed is connected on my X axis mill leadscrew. I like that idea, and it probably would be fairly easy to implement as a clutch. I hadn't thought of that. |
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