Epoxy and Clamps
Jetijs,
Remember that your last stator ended up being glued slightly out of alignment. So, it is very important to glue the stator pieces together exactly right.
I recommend that you build a jig to hold all of the pieces between two flat plates of steel or thick aluminum. Mount four guide posts to the bottom plate so they go through the mount holes of the stator pieces with very little clearance, and on into the top plate. This will keep all of your stator pieces in alignment. If you use an epoxy, make sure you use some sort of "release" compound on the guide posts or you will never get the stator out of the jig after the epoxy hardens. A silicon or Teflon spray can work well in this situation. Spray the guide pins multiple times and let the silicon dry completely before use. These guide pins should not be threaded, so they provide a uniform positioning reference for each lamination in the stack.
Use a slow acting epoxy so you have enough time to coat and place each lamination in the stack and clamp the jig tight before the epoxy cures. After you clamp the stack tight, wipe off as much excess epoxy that is squeezed out as you can before it hardens. The more you can clean up the edges before the epoxy cures, the easier it will be to finish later.
Think each step through and build all the necessary tooling to make it right the first time. Make sure the guide pins can release from the mounting plates independently from the stator stack in case your "release" compound doesn't work perfectly, and the guide pins have to be pounded out later. Cover the top and bottom of the mounting plates with "release" compound, or wax paper, so the epoxy doesn't stick to them.
Test the system completely BEFORE you apply the glue, and make sure everything aligns properly. Don't be in a hurry. This is a very important procedure and it must be done 100% perfectly, the first time, for the motor to work well with a critically small air-gap.
Once this is done, you should be able to chuck the stator piece into your lathe and using a ceramic cutting bit, carefully re-surface the inner diameter (that faces the rotor) to produce a perfectly uniform curvature.
A similar procedure should be followed when gluing the rotor pieces together.
Well, that's all I can think of for now.
Keep up the great work!!!
Peter
Originally posted by Jetijs
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Remember that your last stator ended up being glued slightly out of alignment. So, it is very important to glue the stator pieces together exactly right.
I recommend that you build a jig to hold all of the pieces between two flat plates of steel or thick aluminum. Mount four guide posts to the bottom plate so they go through the mount holes of the stator pieces with very little clearance, and on into the top plate. This will keep all of your stator pieces in alignment. If you use an epoxy, make sure you use some sort of "release" compound on the guide posts or you will never get the stator out of the jig after the epoxy hardens. A silicon or Teflon spray can work well in this situation. Spray the guide pins multiple times and let the silicon dry completely before use. These guide pins should not be threaded, so they provide a uniform positioning reference for each lamination in the stack.
Use a slow acting epoxy so you have enough time to coat and place each lamination in the stack and clamp the jig tight before the epoxy cures. After you clamp the stack tight, wipe off as much excess epoxy that is squeezed out as you can before it hardens. The more you can clean up the edges before the epoxy cures, the easier it will be to finish later.
Think each step through and build all the necessary tooling to make it right the first time. Make sure the guide pins can release from the mounting plates independently from the stator stack in case your "release" compound doesn't work perfectly, and the guide pins have to be pounded out later. Cover the top and bottom of the mounting plates with "release" compound, or wax paper, so the epoxy doesn't stick to them.
Test the system completely BEFORE you apply the glue, and make sure everything aligns properly. Don't be in a hurry. This is a very important procedure and it must be done 100% perfectly, the first time, for the motor to work well with a critically small air-gap.
Once this is done, you should be able to chuck the stator piece into your lathe and using a ceramic cutting bit, carefully re-surface the inner diameter (that faces the rotor) to produce a perfectly uniform curvature.
A similar procedure should be followed when gluing the rotor pieces together.
Well, that's all I can think of for now.
Keep up the great work!!!
Peter
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