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  #1  
Old 11-16-2010, 09:44 PM
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Default How to realign a top plate

This a problem more people run into then it is brought up. Today I had a perfect example of a shifted top plate at work and wanted to use it to demonstrate how to realign a shifted top plate on an already magnetized motor. We have many easier ways to do this at work but I wanted to demonstrate using tools everyone at home should have so they can do this.

Here is the subject


The first step is to put a good size threaded bolt through all of the tapped holes, make them pretty evenly and raise them about .25" at a time.

From here you should be able to scoot the top plate off with a rubber mallet, or how ever high it needs to be to clear the pole piece.

Once removed inspect that the top slug does not have any substantial cracks, if it does then other steps need to be taken but in many cases you should be fine.


In this case it appears TC forgot to use activator on their glue and that is the reason for this fail. It is best to scarp all glue clean of the motor and top plate. Make sure to make the top plate abrasive by using sand paper or other similar methods. (something most companies also forget).

From here put the Loctite (we use 770) activator on the slug and the glue on the top plate. I use 2" bolts but with neo or larger motors id recomend 3". Use a spare coil or aluminum sleeve and then begin shimming both the inside and outside so that the coil is solid in place and there is no play in the TP. In this case I used two .005" shims on in the inside and two .005 and a .0025 shim on the outside. If you dont have shims many people use overhead sheets from local stores.
Your motor should now look similar to this


From here lower all the bolts down as evenly as possible, I like to go by hand for the first 1-1.5" then it begins to get harder and I use a ratchet. The magnetic feild should pull tight on that glue bond and it should adhere in 20-30seconds.

Here is the end result.
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  #2  
Old 01-26-2013, 01:59 PM
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Thanks for the p.m and sending me to this thread, I will deff be doing this asap. seems very easy, esp since i already have the top plate removed. thanks I will be doing this as soon as i get a free minute.
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Old 04-10-2013, 11:07 AM
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Well after a crazy few life changes I finally get a free minute to myself. You said to use loctite 770 activator but what glue would I be using? let me know what one to use, thanks!
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Old 04-10-2013, 11:21 AM
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Great info thank you for sharing.
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Old 04-10-2013, 01:10 PM
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Quote:
Originally Posted by PDAOaudio View Post
Well after a crazy few life changes I finally get a free minute to myself. You said to use loctite 770 activator but what glue would I be using? let me know what one to use, thanks!
You can use this activator with several bonding agents from loctite. 401 and 454 are great choices to use.
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Old 04-10-2013, 01:57 PM
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Nice walk through man. U make it seem so easy


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Old 05-31-2013, 09:57 PM
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Quote:
Originally Posted by bumpin buick View Post
You can use this activator with several bonding agents from loctite. 401 and 454 are great choices to use.
Thanks a million!!!!
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Old 07-15-2013, 09:32 AM
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nice thread!! always wondered a good way to approach this problem
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