Machine lash, acceleration, or what?

Discuss Thermwood 3-axis Machinery, Controller, and Software.

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Michael S Murray
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Re: Machine lash, acceleration, or what?

Postby Michael S Murray » Tue, Apr 17 2012, 8:26AM

Pull your covers and check your drive belts....
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Jeremy Schiffer
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Re: Machine lash, acceleration, or what?

Postby Jeremy Schiffer » Tue, Apr 17 2012, 4:14PM

Is there an adjustment on the drive belts, Michael? The machine is just 3 years old, and certainly doesn't run full-time. Do they stretch and need re-tensioning?
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Re: Machine lash, acceleration, or what?

Postby Forrest Chapman » Tue, Apr 17 2012, 5:03PM

I've had my machine 10 years this December and have yet to replace the drive belt on the Y axis. I have a moving table with direct drive so no belt there. The extra belt I have will probably be shot by the time it is needed. Forrest

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Neville Bastian
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Re: Machine lash, acceleration, or what?

Postby Neville Bastian » Tue, Apr 17 2012, 8:07PM

Hi Jeremy.
Glad you solved the quality issue of the tenon cut.
I noticed you dropped your feed speed. We did go down that route a few years back but were getting low hrs on the router bits. When we checked with our supplier they said our feed speeds were too low and were actually causing excessive heat and low removal of waste stock. Yours may be right but if your long term records show your hrs have dropped this could be the reason.
Some companies are good at giving advice on the router bits but some just send you a catalogue of router bits more or less saying work it out yourself? :lol: Well that was a recent experence.
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Neville
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jason galbraith
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Re: Machine lash, acceleration, or what?

Postby jason galbraith » Wed, Apr 18 2012, 5:38PM

You are not wrong Neville. I've yet to come across a single router bit seller that can give me any guaranteed advice on what type of bits to use, and correct feed speeds other than give me a genralised chart of what SHOULD work.
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Jeremy Schiffer
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Re: Machine lash, acceleration, or what?

Postby Jeremy Schiffer » Thu, Apr 19 2012, 10:31AM

The main thing we struggle with is finding the balance between a feed & spindle speed that is fast enough not to burn the bit, but slow enough so the bit doesn't deflect an unacceptable amount. I'm considering going to a 1/2" bit for the outline cuts, anyone with any advice there?
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