Resolver to Scale -Qaudrature

[bigalow]

I have a machine with resolver feedback and I would like to install scales. Parameters for feedback resolution are not accessible.
Any idea's or recommendations???

[One of Many]

It may be easier to find a replacement resolver or have yours repaired. The output signal attributes would need to be known in order to emulate that of the resolver the control was configured to interface with. There may also be a conversion on the machine to interface the resolver to the control that could be eliminated to interface a quadrature signal directly.

In order to get more response, the make, model and control of this machine would be handy for those reading your query. This may have already been done before by someone with information somewhere. Slim chance yes, but at this point more information just might increase your odds?


DC

[WGoyer]

If you have the numbers from the side of the resolver, I may at least be able to get some data.
Generally, controllers that read resolvers are difficult to convert to optical scales. What kind of CNC do you have?

Warren
www.uptimecorp.com

[bigalow]

Cincinnatti Heald 2EF. Grinder. Heald control -propietory Wanted to update to scales to optimize accuracy. I have never updated resolvers. Sounds like it would be difficult at best!! No access to parameters.

[Al_The_Man]

Heidenhain scales have sinusoidal output, which equates to a resolver signal, but if you cannot change the resolution, you may be at a dead end, control wise.
Al.

[bigalow]

Is there any scientific way to figure out the scaling of a resolver feedback system? Ex: an encoder has counts per revolution.
How could I adapt a Hiedenhain scale with out access to the scaling parameters????

[WGoyer]

I'm asked almost every week to either quote adding scales to an old machine or to fix up someone's bungled attempt to add the scales first, then integrate them. The worst example was two years ago when the scale sales person sold, delivered, and mounted some very nice Heidenhain scales on a Wotan Boring mill, only to find that the encoder interface was no longer available from Allen Bradley. That little miscalculation cost the use of the machine for a year (while the plant manager got on his knees and begged for money to fix it) and over $80K US to put a new CNC and motors on.

I suggest, that if this machine ever worked well with resolvers, that it be fixed mechanically again so it can still work with resolvers.

We retrofitted a very old Cincinnati grinder two years ago. It still holds microns on the OD without scales and does the finish grind on turbine rotors worth $250K US. Grinders are about repeatability, not absolute values.

I've rarely seen happy customers when they go down this path.

Warren
www.uptimecorp.com