Linear encoders... Noob question

Post anything you want to discuss with others about the software.

Linear encoders... Noob question

Postby Robertspark » Sat Sep 15, 2018 9:14 pm

Linear encoders (glass scale )

Do they retain or provide absolute position without the need for homing?

Or would I still need to home the machine at pc boot / reboot

Thanks :roll: :oops:
Rob
Einstein ― “If you can't explain it to a six year old, you don't understand it yourself”
...working my way through the 1000+ ways things don't work to find the one that does
UC400eth, UC300eth, UCCNC v1.2106, Neuron Lite
UCCNC v1.2105 Macro Manual
Robertspark
 
Posts: 988
Joined: Sat Sep 03, 2016 4:27 pm
Location: Nr Liverpool, England

Re: Linear encoders... Noob question

Postby Vmax549 » Sat Sep 15, 2018 9:27 pm

It depends on what type you have INC or ABS. ABS hold their info by a battery backup and know where they are at any given point in time. The motion controller would have to be able to TALK to an abs encoder to be able to interface.

In a nutshell, (;-) TP
Vmax549
 
Posts: 1307
Joined: Sun Nov 22, 2015 3:25 am
Location: USA

Re: Linear encoders... Noob question

Postby beefy » Sat Sep 15, 2018 9:49 pm

The glass scales on my lathe and milling machine also have a "hard" reference point (basically their way of being homed after power loss, etc).

So just like knowing your work offsets from your typical home switches, if you know the glass scale offsets from their "hard" reference points, you can always get back to where you were, even if any glass scale backup battery died during machine power off.

Keith.
beefy
 
Posts: 197
Joined: Mon Sep 05, 2016 10:34 am

Re: Linear encoders... Noob question

Postby Robertspark » Sat Sep 15, 2018 10:03 pm

Thanks Terry and Keith,

I was thinking of wiring some ahem... Chinese.... Glass encoders up that are normally used with dro kits in the UK.

I suspect they will just be incremental, the absolute bit will be in the dro control box.

I'll give them a miss then and get some sort of a static homing reference point
Rob
Einstein ― “If you can't explain it to a six year old, you don't understand it yourself”
...working my way through the 1000+ ways things don't work to find the one that does
UC400eth, UC300eth, UCCNC v1.2106, Neuron Lite
UCCNC v1.2105 Macro Manual
Robertspark
 
Posts: 988
Joined: Sat Sep 03, 2016 4:27 pm
Location: Nr Liverpool, England


Return to General discussion about the UCCNC software

Who is online

Users browsing this forum: No registered users and 2 guests