Acorn Spindle Encoder Basics

[martyscncgarage]

Check with Automationdirect.com see if they will ship to you.
https://tinyurl.com/yclkgt9w

I think PLC Center just buys, marks them up and resells...

[rruizvial]

We sell 2000 line (8000 counts per revs) encoders that accept common sized motor encoder shafts on our website.

2000 Line Encoder (8000ppr)
This differential encoder not only suppresses noise in the system that can be harmful to encoder signals, but also outputs a quadrature signal giving 8000 counts per revolution of the motor. This is ideal for machines already equipped with DC brush servos to enhance the speed and precision of the machine. Available in 6 mm, 1/4", 3/8", and 1/2" hollow shaft sizescomp_encoder_large.jpg

I have a spindle servomotor mill with 1/2" shaft (10.000 rpm). Where sell a 1/2" hollow shaft encoder in the centroidcnc website??

[tblough]

It will be tough finding a 10,000rpm capable encoder. When you do, it will not be cheap.

https://www.rls.si/eng/re22-rotary-magn ... ft-encoder

https://heidenhain.us/pdfs/RENCO-R35i-R ... atalog.pdf

https://www.heidenhain.com/fileadmin/pd ... 529_en.pdf

If you can't find a hollow bore encoder in that rpm range you may have to use a shaft encoder instead. You need to observe the mechanical rpm limit, and both the encoder's and the control's bandwidth limits.

[rruizvial]

It will be tough finding a 10,000rpm capable encoder. When you do, it will not be cheap.

https://www.rls.si/eng/re22-rotary-magn ... ft-encoder

https://heidenhain.us/pdfs/RENCO-R35i-R ... atalog.pdf

https://www.heidenhain.com/fileadmin/pd ... 529_en.pdf

If you can't find a hollow bore encoder in that rpm range you may have to use a shaft encoder instead. You need to observe the mechanical rpm limit, and both the encoder's and the control's bandwidth limits.

Yes, the problem is the servomotor diameter shaft (1/2") and your 10.000 rpm.

[cncsnw]

It could be done with a modular "kit" encoder, such as the US Digital E6:
https://www.usdigital.com/products/enco ... tal/kit/e6
Installation is more challenging, but it will handle the RPM.

[rruizvial]

https://ecatalog.dynapar.com/ecatalog/i ... ers/en/F18

Max. Operating Speed 12,000 RPM

There are someone that help to configure this encoder for acorn???

servomotor diameter shaft OD = 1/2"

[martyscncgarage]

https://ecatalog.dynapar.com/ecatalog/i ... ers/en/F18

Max. Operating Speed 12,000 RPM

There are someone that help to configure this encoder for acorn???

servomotor diameter shaft OD = 1/2"

There isn't much to it.
Just match up the colors of the encoder cable to match the Acorn Encoder port. Every schematic has that pin out.

We are assuming this servo motor has its matching drive and already works?
I am guessing you are trying to use a SERVO motor as a spindle motor, which must be belted at 1:1 with the spindle with a timing belt, to save yourself from having to mount an encoder directly to the spindle. (Make sure you get at 5V, Line Driver/Differential Encoder)

Your challenge may be TUNING the servo to the spindle.

Good luck
Marty

[rruizvial]

https://ecatalog.dynapar.com/ecatalog/i ... ers/en/F18

Max. Operating Speed 12,000 RPM

There are someone that help to configure this encoder for acorn???

servomotor diameter shaft OD = 1/2"

There isn't much to it.
Just match up the colors of the encoder cable to match the Acorn Encoder port. Every schematic has that pin out.

We are assuming this servo motor has its matching drive and already works?
I am guessing you are trying to use a SERVO motor as a spindle motor, which must be belted at 1:1 with the spindle with a timing belt, to save yourself from having to mount an encoder directly to the spindle. (Make sure you get at 5V, Line Driver/Differential Encoder)

Your challenge may be TUNING the servo to the spindle.

Good luck
Marty

The spindle of my mill is connected with a belt to the axis of the servomotor (1:1). The problem I have is that the servomotor (0 to 10,000 rpm) originally has a resolver and i have to change it to an encoder that has these characteristics:
1. Ability to mechanically for 10,000 rpm.
2. Have the technology that can be connected to the acorn, and the acorn can receive the signal correctly.
3. Designed to be installed on a shaft on top of the servo-mortor for a 1/2-inch outside diameter.

Dynapar's encoder satisfies conditions 1 and 3, but conditions 2, I'm not as clear as to how it is configured.

[tblough]

For the Acorn (or any Centroid product) you need 5V differential line-driver quadrature output (also known as RS422).

[martyscncgarage]

You have to keep the original spindle drive, which will likely require that resolver.

I'm not clear what your spindle drive is, but do not remove anything from the spindle motor unless you are sure.

As Tom and I said, if you call Dynapar application Engineer, let them know what you need and that your controller requires 5vdc line driver/differential (RS422) signals. They will tell you which encoder they recommend.