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Loud buzzing sound at high speed
Posted: Mon Jul 15, 2013 2:19 pm
by amalone88
Hi,
I am new to these forums and have tried to search for this problem but I am not quite sure what is causing this.
I have a 510 that is making a horrible grinding/buzzing sound when I approach the top speed of the headstock. I have tensioned the poly v and oiled the sheaves.
From reading the forums, I am thinking that it is one of four problems but I am not sure of what troubleshooting I should take to diagnose this.
1. The sheave spacer between the motor and floating sheave is worn.
2. The drive belt is worn out (I measure this at .55")
3. The fan sheave set screw is loose (not sure where this is)
4. The top speed is set to high.
Posted: Mon Jul 15, 2013 5:52 pm
by SDSSmith
amalone88 wrote:Hi,
I am new to these forums and have tried to search for this problem but I am not quite sure what is causing this.
I have a 510 that is making a horrible grinding/buzzing sound when I approach the top speed of the headstock. I have tensioned the poly v and oiled the sheaves.
From reading the forums, I am thinking that it is one of four problems but I am not sure of what troubleshooting I should take to diagnose this.
1. The sheave spacer between the motor and floating sheave is worn.
2. The drive belt is worn out (I measure this at .55")
3. The fan sheave set screw is loose (not sure where this is)
4. The top speed is set to high.
I would check the high speed stop if the noise only occurs when you increase the speed to the maximum.
Posted: Mon Jul 15, 2013 5:55 pm
by tvidnoviciii
As to #4, if you shut the machine off at high speed, the top of the belt should be between 1/16 and 1/8 inch below the edges of the floating and fan sheeve. If it is less than that then the high speed setting needs to be adjusted, as seen here:
http://www.shopsmithacademy.com/SS_Archives/SS123/SS123_Shopsmith_Reborn_Pt3.htm
Posted: Mon Jul 15, 2013 6:11 pm
by JPG
Tis possible the control sheave is hitting the speed control(high speed stop adjustment incorrect).
Posted: Mon Jul 15, 2013 7:14 pm
by joedw00
I don't have any suggestions, but welcome to the forum.
Posted: Wed Jul 17, 2013 5:24 pm
by amalone88
Resetting the high speed fixed the issue.
Thanks for the advice and link to the video. Great information!
Posted: Wed Jul 17, 2013 6:29 pm
by billmayo
The buzzing noise is from the motor drive belt rubbing the idler shaft. The control sheave moves too far from the idler sheave. I believe the buzzing is from the vane tips riding near the outside edge of the belt. Sometimes if the headstock is stopped at this speed, a worn belt will wedge under some of the vane tips and lock up the rotation. Resetting the high speed adjustment keeps the belt off the idler shaft. I found I could get over 6000 RPM on the quill shaft sometimes when I allowed the belt to just rub on the idler shaft. No real reason to want to do this, it just happen when pretesting a customer headstock.