spindle speed readout

[JohnCoker]

Anyone able to explain why f=200 means 12,000 RPM? The spindle controller for the alpha reads out in RPM; why wouldn't the smaller Delta spindles do the same?

Is there a way to fix the display so that it reads in more useful units or is the real solution to get the spindle speed controller card?

[Burkhardt]

Anyone able to explain why f=200 means 12,000 RPM? The spindle controller for the alpha reads out in RPM; why wouldn't the smaller Delta spindles do the same?

Is there a way to fix the display so that it reads in more useful units or is the real solution to get the spindle speed controller card?

f is frequency in Hz, i.e. cycles per second. 200 hz times 60 seconds per minutes will get you 12,000 rpm with a single pole asynchronous motor. I can not answer the question how to get rpm readout directly.

[JohnCoker]

f is frequency in Hz, i.e. cycles per second.

OK, that makes sense, thanks, and easy enough to do the conversion arithmetic.

[scottp55]

John, Do you have this?

[JohnCoker]

Thanks for the table. I notice it has 3m of warmup time instead of 10m, which seems a lot more reasonable.

[scottp55]

John, 3 minutes EACH 150,200,250. If you need a timer Graeme(Coogara) sent me one from the wonderful world of OZ, and said I could pass it on, but it's too big for forum as a .zip. PM or e-mail if it would help. .wmv is an Australian cop siren I think, rather hard to ignore

[jwa1156]

I was working out an issue with TJ's help
He said there was a way to change the Spindle fro F to RPM buy changing the some connections inside the control box and Tech Support could give me
the particulars.
I am a Legally Blinded OIF Vet and not usre I want to attempt to re-wire the controller
I found a digital TAC on amazon for about $20 to have it give me the RPN reading from the spindle