Mesa card selection for machine with resolvers - resolver questions

Hello,

we use this type of inductisyn scales on retrofitted machining center with VEGA converters. But it is hard to setup the converters. Easier and better to install new incremental linear scales. This inductosyn is technology from `60.-s.

Hi. I also replaced the linear scales but the two rotary axes required very high resolution and it was cheaper to keep the rotary inductosyn encoders.

I purchased Farrand control converters on eBay and manages to set them up using the original pre-amps.

I am very happy with the result.

Henk

Hi Henk, are you from RSA - I am from Port Elizabeth and am trying for many years to find a solution for my home cnc machine which has old resolvers on it - I want to go LinuxCnc type retro but want to use the old stuff - it's a home hobby not a production machine so I am looking to save where I can - you mention Farrand control converters (is this able to convert analogue to digital signal on resolvers etcetc)
I would appreciate any input + I am aware of SA CnC club but it's in JHB and too far for me to attend lectures

Pico Systems has a single channel resolver to quadrature converter for US $150, that is compatible with most so-called brushless resolvers. It is not compatible with variable reluctance resolvers, they need too much excitation current. Typical resolvers it works with are Kearfott/Singer and Harowe Controls Harosyn.
See pico-systems.com/osc2.5/catalog/product_...ath=5&products_id=31
For more info.

Hi. Yes. I'm from RSA.
I have only used the rotary inductosyn  stuff as shown above, but the principle is the same as a normal resolver.

The linear/rotary inductosyn type has a low inductance (as far is I understand) and the mesa or pico products doesn't work for them, bwich is why I went for the farrand stuff.

But as noted by jmelson above, there are products for the normal wound type resolvers from pico, and mesa electronics.

so it depends very much on the rest of the hardware in the machine and if you can re use that. 

the sa-cnc club meetings are mostly online, so you don't have to travel to Johannesburg  to join.