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Cincinnati
Electrical Tool Inc. |
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CHECKS TO MINIMIZE VIBRATION
Applicable to Type 72 & Type 92 Grinders
| 1. | Is there a vibration when operating without a wheel? |
| When testing without a wheel, always operate with spindle nut and outer flange removed. If no vibration, test with new wheel. | |
| 2. | Is the gib snug? |
| To tighten gib to eliminate “play” in wheel spindle slide assembly - loosen rear gib screw, tighten front screw to tighten gib, tighten rear gib screw. Speed adjustment handwheel should work “hard”. Don't forget to lubricate slide. | |
| 3. | Is grinder on flat, level, solid surface and anchored at all four corners? |
| Sometimes tightening or loosening one corner may eliminate vibration. When the machine is running and vibrating, check each anchor screw independently. If vibration does not cease, tighten screw to its original tension, then go on to the next corner and repeat the procedure. | |
| 4. | Was wheel mounted on inner flange in accordance with the manufacturer's instructions - this side “up” or “down”? |
| Flanges are 12" +0 - .002". The wheel hole is 12" + .008" to .012". The "up"/"down" indicator on the wheel locates the heaviest part of the wheel at the top, placing the out-of-balance condition closest to the spindle centerline to help minimize the out-of-balance condition and subsequent vibration. | |
| 5. | Were the spindle ball bearings replaced - then the vibration started? |
| If so, check the inner flange for runout. The flange face should not runout more than .0015". | |
| 6. | Is the drive package okay? |
| Is the variable speed pulley on the shaft flush against
the bearing nut?
Does the variable speed pulley run true on the wheel spindle - not jumping up and down because of a worn arbor or tapered bore in pulley? Is there proper alignment with the companion sheave? See the instruction manual. Is the belt tracking smoothly? Is the companion pulley worn allowing the belt to "bottom out", causing the cogs to run on the bottom of the pulley? |
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| 7. | Check the motor bearings for wear and the motor slide base for tightness. |