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Sr. Member
Posts: 100
Reply with quote  #1 

This is a new start-up site and what might have been taken for granted does not apply in these circumstances. Everything starts from scratch practically. So I need to organise shims for alignment jobs and I have no idea from where to start.

Is there a standard? 
Can someone suggest the most common range of sizes (and thicknesses) or shall I need to go in the field and measure motor feet sizes? Largest horizontal motor is approx 560kW.
What about materials?

I thank you for your help.

John from PA

Sr. Member
Posts: 963
Reply with quote  #2 
Good guide by Ludeca at  Another document perhaps on a new site is API Recommended Practices for Machinery Installation and Installation Design RECOMMENDED PRACTICE 686.  Section 5.4.2 cover shimming but not to the extent of the Ludeca document.
Danny Harvey

Sr. Member / Moderator / Supporter
Posts: 1,403
Reply with quote  #3 
I would get an A, B, and C size starter kit and order larger ones if needed prior to jobs if that feasible.

How many you will need depends on the conditions you find. In many cases, I find cut sheet metal has been used and I always replace them so sometimes the needs are higher.

Sr. Member / Supporter
Posts: 216
Reply with quote  #4 

It will pay you to get some Sof Shoe shims also. I would get them in the blue, and would get 4 each of B,C, and D size. They are about $10.00 a pop, and will save you an hour or more on an angular softfoot on a medium size motor. On one that is down in a hole and hard to get to (feet and butt in the air, head down) they'll save you more, and you'll praise whoever came up with the idea.

I'd also go ahead and splurge and get the kits with sof shoe included from Precision. They will have each size (b,c,d) stainless shims with the sof shoe. And like Danny said, if you look around and notice a lot of brass shims, no shims, funky looking shims under everything, you might have to order more of a particular couple sizes to get things straightened out.

If you take out some that looks kinda corroded or worn, save them. See if you can clean them up (especially the .005, .010,) and the bigger expensive ones (.075, .100, .125). They will look good when you run out of that size in your kit in the middle of a job.



Sr. Member
Posts: 1,918
Reply with quote  #5 
If you are used to metric get metric and vice verse. A compressor OEM now I guess Johnson Control or similar, always sent shims in inches with their machines and I tried to use them but it messed me up completely.
Good Vibrations since early 1950's, first patented vibrometer 1956 in the US.
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