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Old 04-27-2018, 07:54 AM   #11 (permalink)
 
Join Date: Apr 2014
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Default shake rattle

https://www.youtube.com/watch?v=Y9wTQsAgktg by big joe turner
just could not resist
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Old 04-27-2018, 08:03 AM   #12 (permalink)
 
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Quote:
Originally Posted by hippi View Post
https://www.youtube.com/watch?v=Y9wTQsAgktg by big joe turner
just could not resist
HA! Well played, sir!
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Old 04-27-2018, 08:13 AM   #13 (permalink)
 
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Quote:
Originally Posted by ed4copies View Post
When you change to wood, you probably change the bit (first possibility), you may change your jacob's chuck (2nd candidate)--what else changes? speed?

I would look to the changed variables for a solution.
No speed changes, no Jacobs chuck changes, and it does not matter which bit I use... but only with wood. I'm just about to use my precision alignment tool, aka 5-pound hammer, on it.

I'll try all of the suggestions you guys have posted. Something has got to be causing it!! Now I just need to find it.
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Old 04-27-2018, 09:48 AM   #14 (permalink)
 
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To get the play out of the tailstock and eliminate that as a possible cause, I cobbled together this little jig this morning out of 1/2" plywood. The jig fits to within .005 inches between the ways, and the front was shimmed with layers of tape resulting in less than .01 inch side-to-side movement. We'll see how well it works for drilling later today. Excuse my poor photography (especially on photo 3) -

tailstock-alignment-1_web.jpg tailstock-alignment-2_web.jpg tailstock-alignment-3_web.jpg

Last edited by gtriever; 04-27-2018 at 09:57 AM.
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Old 04-27-2018, 10:31 AM   #15 (permalink)
 
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PROBLEM SOLVED - The jig reduced the shake, but didn't get rid of it. Further troubleshooting showed that the bolt on the motor pivot arm had backed out by 1/2 turn - yes, 1/2 turn! And THAT, my friends, solved the shake problem for now.

Learn something new every day.
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Old 04-27-2018, 12:31 PM   #16 (permalink)
 
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Originally Posted by gtriever View Post
PROBLEM SOLVED - The jig reduced the shake, but didn't get rid of it. Further troubleshooting showed that the bolt on the motor pivot arm had backed out by 1/2 turn - yes, 1/2 turn! And THAT, my friends, solved the shake problem for now.

Learn something new every day.
Interesting.....not on acrylics but on wood, that caused your vibration issue.
Glad you figured it out!
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