Member postings for Peter Andersson 1

Thanks Ian, yes; they are both controlled by the 60Hz, but one of them will rotate 3 times as many as the other one in any given time. If the controlling factor of the motors is the alternating current, i.e. the pulsation of the mains supply, then my take on this would be that the motor that receives the most pulsations per revolution, is the better controlled one...or is this simple logic flawed? the higher the pulsation per revolution ratio, the better...

Hi, I have 2 electric, single-phase hysteresis synchronous motors, one is 1/100HP, 1800RPM and the other one 1/500HP, 600RPM. Both are 117V/60Hz motors.

The 60Hz, I'm guessing, means that there are 60 electrcal pulses/second that "control the motor. The bigger motor does 30 revolutions in a second. During that second, the motor is controlled 60 times by electrical pulsation (60Hz), so every revolution is controlled by 2 pulsations. The smaller motor, on the other hand, rotates 10 times every second, so every revolution should in this case be controlled by 6 electrical pulsations, i.e. being better controlled by the 60Hz AC. I know this might sound like a stupid reasoning, but I felt I had to get my head around this, since I got both motor options available for a project, and felt that the smaller motor might be the more "accurate" one, however academic this might be in real life. Grateful for any kind of constructive input - Thanks!!!

Edited By Peter Andersson 1 on 10/05/2012 15:10:10

Hi Mike,

I've replied by sending you a PM - and MANY THANKS again!!!

/Peter

Thanks KMPand everyone else who replied - so much good input and so fast

I've made a mistake in my info...the two bolts with the fracture lines next to them are actually alignment bolts too. The actual fastening bolts ae not visible in that picture, since I removed them.

Here's a picture showing those with the corresponding little plate that goes on the inside of the lathe bed. Apologies for that. At the same time, with this design and the aluminium, it's not that hard to see how this might eventually happen.

Edited By David Clark 1 on 17/04/2012 18:32:36

Hi Ady1,

I see your point,but this attachment actually is a cast block of aluminium, approx 7"x5"x3.5". I'm not knowledgeable enough to be able to procuce this size & shape. I was thinking along the lines of whether there's a possibility to repair (weld?) these cracks, or if I could have a steel backing plate made to support the "wings" of this block (i.e.the parts of the attachment bracket with the holes and bolts in it)?

Edited By David Clark 1 on 17/04/2012 17:03:23

Hi everyone - first post here!

I have acquired a Hobbymat MD65/BFE65 lathe/mill. On closer inspection, I found that the attachment bracket for the mill onot the lathe has 2 cracks in it. The material is aluminium, and I'm now wondering what can be done to establish stability and rigidity as far asconnecting the mill to the lathe please?

Any advice is greatly appreciated.

Edited By David Clark 1 on 17/04/2012 17:02:31