I am still struggling with making an encoder adaptor that would gointo the top of my spindle (spindle is hollow, with a 26mm hole), andhave a 3/8" shaft protruding on top to mount the encoder disk.After a few things that did not work, I am settling on simply makingthis adaptor out of 12L14. It should be easy to make on a lathe. I amthinking how to avoid making it "expand" but just stay in placewithout expanding. Whet I would like, I think, is make it fit the spindle precisely, yetwithout any significant force involved (that is, not press orinterference fit), but use some weak glue to hold it in place. This isso that I would pull it out easily when necessary.Would anyone have any suggestions as to the glue. Thanks

Why don't you want it to expand? It seems that a couple of rubberplugs, sized very closely to the shaft, could compress just a little -maybe .010 or so - and give a nice fit. Of course, I don't think youever said (or I never caught) how deep the hole is.Most hot-melt glues release pretty easily and are alcohol soluble.Solid-surface countertop guys use it to glue on clamping blocks whichthey later release by wetting the edges with alcohol.

Weak but reliable metal glue?

Dec 16, 2010 26 Replies

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Wild_Bill 15 years ago

Your reasons Don, are exactly why owning metalworking machines is so great.. fabricating simple parts builds a foundation of experience that will always be useful again in the future. Experience in making simple parts just naturally leads to the ability to make more complex parts. Having to use halfassed parts/materials to try to accomplish a task is utterly frustrating compared to having the ability to make a quality part that improves the performance and/or reliability of device/machine/tool etc.

An expanding adapter was one of my early lathe projects (an expanding shaft to adapt a hand crank to a benchtop lathe spindle bore, on a model without low/variable speed capability), and I haven't/wouldn't hesitate to make others for different applications.

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F. George McDuffee 15 years ago

========= see our class version for an Emco-Meier Compact 10

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A spindle crank offers a great deal of utility to home/hobby shop machinists, particurarly when threading to a shoulder and/or using metric change gears. Large diameter fine threads as for camera/lens adapters are also much easier using the hand crank.

-- Unka George (George McDuffee) .............................. The past is a foreign country; they do things differently there. L. P. Hartley (1895-1972), British author. The Go-Between, Prologue (1953).

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Lewis Hartswick 15 years ago

On our Bridgeports, the direction of rotation is not linked to the mechanical, IN or OUT of back gear. so you can always run the spindle in any direction regardless of "speed range". I guess the power downfeed would be a problem though. :-) ...lew...

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Ignoramus30138 15 years ago

On Series II Interact 2, back gear reverses the rotation.

This would not be a problem, ordinarily, as I could command the mill to run "in reverse" when drilling, milling etc and it would be great. However, when rigid tapping, the control wants to run the spindle "forward", which in back gear actually means reverse. This is the problem with rigid tapping.

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Pete C. 15 years ago

You need to configure EMC2 to reverse it's spindle direction control depending on the selection of the high/low gear range.

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Ignoramus30138 15 years ago

Yep. I think that I can do it with some and2 elements.

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DoN. Nichols 15 years ago

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I believe I suggested back when you were early in this project that you set up a switch to sense the lever in the back-gear position, and use that to either tell EMC2 to command the opposite direction, or simply have it work a relay to interchange the forward and reverse pins on the command to the VFD.

Admitedly, I was not thinking of rigid tapping -- but things like burning out end mills or drill bits because you are running them backwards.

Good Luck, DoN.

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