Power Transmission Using a Hollow Pipe

First Quality ~ First Time

Apparatus Repair & Engineering, Inc.

A.R.&E. is the Premier Electric Motor Sales, Service, and Repair facility in the quad-state region of Maryland, Pennsylvania, West Virginia, and Virginia. This business began in 1927, and we are proud to continue the efforts of the founding partners who have served the local Commercial and Industrial markets over these many years. Times have changed in the many years since the inception of this business, and A.R.&E. is growing and changing with the times. Today the use of AI, computers, and factory automation is necessary for businesses to remain competitive in the global market, and A.R.&E. is here to assist with those challenges. And we promise our work will be... First Quality ~ First Time.

Fabrication Generators Spray Welding Rewinding Happy Thanksgiving


This is an example of an automated oil dispensing tank and pump system that was totally designed and built by A.R.&E. for a local manufacturer...

Generator Install

Here's what an emergency generator installation can look like when A.R.&E. is involved...


Sometimes it's necessary to "buildup" a metal surface that's been damaged by wear. Metalizing is one method of doing just that...


Total rewind of a customer's electric motor. Sometimes, though no one's fault, an electric motor "burns up." That's when our rewind department shines. Here's the technician is rewinding this small motor, and in a couple of hours it'll be "as good as, (or better than) new"...


Turkey and dressing is the classic dinner at this time of year. Thanksgiving Day is an annual national holiday in the United States and Canada celebrating the harvest and other blessings of the past year. The American tradition has us attempting to recreate the dinner between the Pilgrims and the Native Americans. However you celebrate, we at Apparatus Repair & Engineering, Inc. want to wish you all a Safe, Blessed and Happy Thanksgiving.

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Sleeve Couplings

Sleeve Coupling

A "Sleeve Coupling" is pretty straight forward, if you look at the picture above. Some instances refer to this coupling as a "Muff Coupling" or maybe a "Split Muff Coupling", probably referring to the shape of the coupling in comparison to a "Muff" used to keep one's hands warm in colder climates. In either case, it is basically a piece of round steel stock, (maybe even considered a pipe) bored to some internal dimension (as necessary), usually having a keyway cut, then the sleeve is cut in half and bolts (or in this case) cap screws bored and threaded to hold the two halves together. In smaller units, the method of "attachment" to the shafts may simply be an "Allen Set Screw". Usually that set screw is positioned over the keyway so that it tightens onto the key to hold it in place, also. If we talk about REALLY SMALL sleeves, they may only have the set screw and rely totally on that object to transmit the torque as well as hold the coupling in place. In this case we're talking here about "micro" or "mini-fractional" horsepower motors and equipment. That's it!

And while this is the simplest of "Sleeve Couplings", there are certainly modifications and hybrids that do the same thing but with somewhat different characteristics. One thing that all of them will have in common is that they are part of the "Rigid Coupling" family. When this coupling is bolted  together around two mating shafts, there isn't any room for flexibility and/or misalignment. Transmission of power is 100% with no loss due to friction or flexing of the torsional member... 'cause there simply isn't any! Based on the fact that angular and parallel alignment is a REAL issue, we definitely recommend Laser Alignment or expert dial indicator alignment of equipment at installation.

A final note on the "Sleeve Coupling" has to do with a hybrid that we find in numerous pieces of equipment requiring repair. Specifically, the shaft coupling on hoist motors designed by Reuland on various manufacturer's hoists and cranes. This coupling is a "Sleeve" but rather than being split, and having a smooth (or keyed) bore, this "Sleeve Coupling" is "splined" it's entire bore length. Again, this is just an example of a hybrid on a specific application.

A.R.&E. can assist you in the proper selection of any application requiring a "Sleeve Coupling". So give us a call.