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Re: Encoder Basics

Posted: Mon Mar 14, 2016 3:41 pm
by CNCinTN
Just a supplemental followup: I realize that the Centroid AllinOneDC isn't the same hardware as the DC3IOB. So, it would naturally follow that the encoder specs requirements wouldn't necessarily be the same between the two. I only referenced the documentation for the AllinOne DC to highlight the fact that the AllinOne specs allow for a much wider encoder selection as compared to that listed for the DC3IOB. Just thought I'd add that clarification, and I still hope someone from Ajax can help clear up some of my confustion.


Re: Encoder Basics

Posted: Tue Jun 21, 2016 10:59 pm
by b432291
I have the same SEM/Bridgeport (BP Series 2 Interact 2 - SEM MT30R4-58 w/Heidenhain ERO 115 125) servos as the one's in these pictures: ... 5674892594

When I measure my threads I get +0.380, which is MORE than 3/8 - 0.375.

But the encoder in the pics says 10mm bore, which is 0.394 and WILL work for me.

So is the Ajax/Centroid supplied "3/8" encoder actually 10mm?

Re: Encoder Basics

Posted: Wed Jun 22, 2016 3:54 pm
by b432291
Now I'm being told you don't stock the 10mm encoders, but they are clearly in a photoset on YOUR OWN support forum.

In Addition, your kit SPECIFICALLY mentions retrofit of the Bridgeport Series I & II machines of which most use the SEM servos and Heidenhain Encoders!

Is there a "tech note" on which encoders to get for which retrofit machine? Am I asking too much here?

Re: Encoder Basics

Posted: Thu Jun 23, 2016 8:06 am
by Centroid_Liviu
In regards to the 10mm encoders we are trying to source some. Over the hundreds of Bridgeport kits sold I would estimate about less than 10% had 10mm shafts on the servomotors. The lead time getting the 10mm in is really long due to the low volume. Most people usually just used a 1/2" encoder with a sleeve.

Series I and II refer to the size of the spindle motor. They kept the Series I and II designation over the course of about 20 years. It does not refer to the motors or such that the machine is equipped with. You can have a Series I with a Boss 2 Control (stepper motors) or a Series I with a Boss 10 Control (Servo Motors). There are multiple combinations of motors and tachs or encoders that were used over the years. We don't have access to Bridgeports internal documents so we won't assume that a Bridgeport Series II with a V2XT control from 1986 has 10mm Heidenhain encoders for instance. If you do have an encoder installed we can look up the part number and see if its compatible and its line count. If there is no encoder one will have to be installed. If the endcap is removed all that is needed is to measure the shaft diameter to determine the correct encoder size.

In regards to the ERO 115 125, based on other Heidenhain part numbers, the 125 would be the line count. The bare minimum you would need is at least a 1000 line encoder, so the existing encoders would be far too coarse.

Re: Encoder Basics

Posted: Thu Oct 06, 2016 8:51 pm
by cnckeith
10 mm encoders are in stock. we also have 10,000 line encoders in stock as well. call or email for shaft sizes available.
also proper shielded encoder cable and shielded vfd with drain is in stock at very affordable prices.
also new Oak and ALlin1dc schematics sets are available along with the latest Oak and Allin1dc installation and operator manuals on this page

encoder mounting video, servo motor encoder retrofit

Posted: Tue Mar 28, 2017 8:45 pm
by cnckeith
new video on encoder mounting by martyscncgarage. ... STDELrnNx2

Re: Encoder Basics

Posted: Thu Apr 20, 2017 8:58 pm
by cnckeith
I could find on this series of encoder actually publishes the low and high signal level specs! So, what's the real deal with all this signal level stuff?!

Thanks in advance for any assistance you can provide!

3.5 to 5 volts is what you want.. you get any lower than that and you'll get differential errors.
attached is dynapar endcoder spec sheet. centroid uses the 2000 line (8000 count per rev encoders) as a minimum spec encoder.
I've been personally using a Quantum Devices 10,000 line (40,000 count per rev) encoders on all installations with Allin1DC for the last few years with great results.
attached is a pdf photo. you can buy these from centroid or other sources as well and that is what i recommend to use.

Re: Encoder Basics

Posted: Thu Nov 23, 2017 8:51 pm
by RandyL
Can someone verify if this encoder is acceptable for allin1?
No: 740594
V+: 5-24
I am unsure because the other two encoders on this machine were Heidenhain TTL, and are unusable due to "TTL"

Re: Encoder Basics

Posted: Sat Nov 25, 2017 3:58 pm
by cncsnw
I am pretty sure that the "HV" specifier in an EPC part number indicates line driver output, as well as a wide voltage range.

Most EPC encoder labels have a table of signals and wire colors. If there are eight wires listed, with two wires each for the A, B and Z channels, then it is almost certainly a line-driver encoder and will work with the All-in-one DC and other Centroid boards.

Re: Encoder Basics

Posted: Tue Jan 02, 2018 2:11 pm
by woffler
Hi all ,i have a 16 bit encoder differential driver receiver it says on my servo motor for my spindle ,with A+A-,B+B-,Z+Z- it is a 1.8kw servo motor from DMM tech that i use on my lathe .
I was wondering if it would interface with the Acorn board ?