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Member postings for Peter Gain

Here is a list of all the postings Peter Gain has made in our forums. Click on a thread name to jump to the thread.

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Thread: Milling Machine Low Speed Torque
01/08/2009 11:24:43
Hi Don.
Thanks for your reply. The speed controller on my mill/drill is just an electronic type, not an inverter. The supply is 240vac 50hz. As I understand it, the circuit rectifies to DC then when the speed control is turned down the current is chopped into a series of ever shorter pulses until they are so short that the motor stops. Maybe an over simplification but that's the basic principle. (I believe that a similar principle is employed by model railway enthusiasts to provide a reasonably smooth operation at low speeds). The machine works well with end mills, solid or indexable which I run at revs as per Tubal Cain's workshop book, ie several hundred rpm. When the speed is set to (say) 50/60 rpm for fly cutting m/s with an HSS tool anything greater than a 10 thou cut causes the machine to stall as soon as the cutter hits the work piece. I have timed the revs & the digital counter is accurate. It may be the case that I am expecting too much from a Far Eastern product.
Regards,
Peter.
31/07/2009 09:59:02
Hi Steve,
Thanks for your comments. My machine does not have any belts & I cannot change the gearing. The only practical speed change method is by electronic control. Do you have any data to enable me to upgrade the existing controller?
Regards,
Peter.
24/07/2009 14:53:23
I have a Warco WM16 mill/drill. When used at slow speed for fly cutting, even in "backgear" there is very little torque. Either the machine stalls or the speed has to be increased, not desirable when flycutting. I prefer fly cutting as I obtain a good finish & the tooling is easily sharpened in the shop.
Is the lack of torque due to having electronic speed control? Would a mill having belt drive provide better low speed torque? Are there any retro fit electronics that would effect an improvement?
All suggestions will be welcome.
Peter Gain.
 
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