Flange Bearing question

Tommegow

Tommegow

Joined
Dec 16, 2004
Messages
678
I am slowly getting my Clone made. I was going to order the two flange bearing needed for the driveshaft. Two types were available.
One with set screws (am familiar with that)
Second with Eccentric Locking, is this a better choice?
Thanks
 
Mine are the set screw type. If you're getting a drive shaft from Rob it's already set up for this type of bearing.

-d
 
Tommegow said:
making my own 5/8" from O-1 drill rod
so I could use either
Click to expand...

Well, setting up for the set screw type is as easy as just making a small flat on the rod. I'm not certain how the eccentric lock type works. I'd go set screw if only because it's simple.

-d
 
Tom, I experiemented with the eccentric lock design on the KMG several years ago...and opted to stay with setscrews.
 
Tommegow said:
I am slowly getting my Clone made. I was going to order the two flange bearing needed for the driveshaft. Two types were available.
One with set screws (am familiar with that)
Second with Eccentric Locking, is this a better choice?
Thanks
Click to expand...

Since I'm a Service Engineering bearing representative for Timken, I feel qualified to address this question.

The set screw type is for bearings that could rotate in either direction. A suggestion about tightening the set screws and possible shaft damage. This type of collar relies on the set screw tension against the shaft to eliminate inner race turning on the shaft, but can also lead to marring and damage of the shaft. The locking procedure is as follows:
  • Position the shaft in the bearing and remove the set screw.
  • Use a sharpie to mark the two spots on the shaft that the set screw will contact.
  • Remove the shaft and take it to your drill press
  • Drill a dimple into the shaft that is slightly larger than the set screw at each location.
  • Hand file off any raised metal around the outside circumference of these recessed dimples.
  • Reposition the shaft in the bearings as before, and insert the set screws and tighten them down.
  • Avoid overtightening the set screws, as this will cause the inner race to be misaligned with the outer race, resulting in an elliptical roller path and reduced bearing life.

The eccentric locking collar design is for bearings that will only rotate in one direction. So, if you're not going to run the belt backwords, the eccentric locking collar will work, and it will do less damage to the shaft. The most important thing to remember when mounting an eccentric locking collar bearing is to "Lock The Collar in the Direction of Rotation!". This seems to most people to be the opposite of what they expected. If you lock it opposite of the direction of rotation, it will come loose in service. If you lock it in the direction of rotation, it will tend to tighten during service. The eccentric locking collar does have set screws in it also. How much you tighten the collar matters also. The procedure for mounting an eccentric locking collar is as follows.
  1. Install the eccentric onto the bearing sleeve and rotate to hand tight in the direction of rotation.
  2. Using a punch and hammer, place the punch in the hole on the collar and firmly strike it once to move the collar in the direction of rotation.
  3. Lock down the collar on the bearing sleeve with the set screws.

If you get the collar too tight, the inner race will be forced out of alignment and result in an elliptical roller path, thereby reducing the bearings life. It is also possible to crack the inner race or eccentric collar if it is tightened too much.

There is a third type of locking collar. It is called a "Concentric locking collar" design. This design results in increased rotational accuracy and reduced vibrations during operation. In place of an eccentric locking collar, there is a concentric ring on the bearing sleeve. It is threaded through the concentric ring, but instead of the set screws being at Noon and 3 oclock as in the set screw type, the set screws are at Noon and 4 oclock. This results in a more uniform distortion of the inner ring during service, than the Noon/3 oclock type can achieve. Also, since the set screws tighten down against the inner ring, and there is no set screw contact with the shaft, this type results in less damage to the shaft than a set screw type does.

I personally would choose this Concentric locking collar design over the other two, because it will be the smoothest running bearing design.

Scott (Ickie) Ickes
 
scottickes said:
Since I'm a Service Engineering bearing representative for Timken, I feel qualified to address this question.

<snip loads of useful info>
Click to expand...

Isn't it great to have subject matter experts in our midst? Thanks for the excellent info Scott. I'm going to have to go back and re-do my shaft installation now since I now know I did it wrong the first time. :)

Thanks!

-d
 
deker said:
Isn't it great to have subject matter experts in our midst? Thanks for the excellent info Scott. I'm going to have to go back and re-do my shaft installation now since I now know I did it wrong the first time. :)

Thanks!

-d
Click to expand...

You're welcome. That will be a $50 consulting fee please. ;)
 
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