Switches

All info relating to the Denford Mirac lathes

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vidio1
Posts: 25
Joined: Wed 12 Sep , 2018 8:56 am

Switches

Post by vidio1 » Sun 27 Jan , 2019 4:56 am

Silly question but does the Mirac use a mix of proximity and contact switches for home and limit? My X home looks like a proximity and my Z limit feels like a contact switch. I'm just looking and feeling around for what I can without tearing the machine apart.

Martin
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Re: Switches

Post by Martin » Mon 28 Jan , 2019 16:23 pm

We used 2 different controls on the Miracs. GSM & Baldor. Both were fitted with sensors for homing the X & Z axis.

From looking at the drawings the GSM uses a three wire sensor & the Baldor a 2 wire sensor.

vidio1
Posts: 25
Joined: Wed 12 Sep , 2018 8:56 am

Re: Switches

Post by vidio1 » Tue 29 Jan , 2019 4:24 am

I removed the way cover to get a better look. Attached is what I was asking about. It appears there's a proximity switch on X and a roller contact switch on Z. So why is it like that? I'm assuming the proximity for safety reasons, but why use a contact switch that's subject to bounce and arcing issues. Is it the same on the opposite ends of each axis?
Attachments
PICT0039.JPG
PICT0039.JPG (257.71 KiB) Viewed 7674 times
PICT0038.JPG
PICT0038.JPG (328.85 KiB) Viewed 7674 times

Martin
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Re: Switches

Post by Martin » Tue 29 Jan , 2019 9:31 am

The switch in the second photograph is the Z- limit switch which can be adjusted to stop the tooling crashing in to the Chuck depending on what's fitted.
If you look on the opposite end of the bed you should see the datum proximity sensor.

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