Re:Hardinge CHNC 1 Lathe

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27 Feb 2010 23:21 #2106 by Kirk_Wallace
I use the same wsum method on my turret:


except I have a Hal component instead of the PLC.
www.wallacecompany.com/cnc_lathe/HNC/emc2/turret.comp

Unless I was mistaken John was talking about an override encoder, which I think could use a similar technique. The down side is the number of wires needed to go from the operator panel to the EMC PC. That's why I was thinking about using SPI.
--
Kirk Wallace
www.wallacecompany.com/machine_shop/
www.wallacecompany.com/E45/index.html
California, USA

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28 Feb 2010 00:38 #2107 by BigJohnT
Replied by BigJohnT on topic Re:Hardinge CHNC 1 Lathe
Kirk,

The feed override switch I used wsum to get 0 - 12 but there is no way to use that output ATM in EMC :( To control the feed override. You can only use a + - input to halui to change the feed override.

I wish my turret encoder was nice and clean like yours LOL and wish it worked. Mine is completely enclosed in rubber or some rubber like material so I can't see the switches.

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28 Feb 2010 01:43 #2108 by Kirk_Wallace
Thanks. I didn't know that halui worked that way with the override.

My encoder had the same rubber covering, but it was falling off, so I removed it. I figured removing it wouldn't make things any worse, so far, so good.
I made new cork gaskets for the cover and installed o-rings and bushings under the cover screws. The area under the turret table was venting air leaks and oil into the encoder area, so I had to fix all of the air leaks. There are two normal air vents in the system, which I think are placed at the ends of the air passages for carrying the air/oil to the ends of the lines. These vent outside though.

You should be able to fix your encoder board fairly easily. The encoder chips are still available:
search.digikey.com/scripts/DkSearch/dksu...l&name=296-3533-5-ND
www.electronics-tutorials.ws/combination/comb_4.html

The Hall switches are common, here is one example, but is in a smaller package:
search.digikey.com/scripts/DkSearch/dksu...5881LUA-ND&x=16&y=17

If you prefer, you could send your board to me and I'll fix and return it for free.
--
Kirk Wallace
www.wallacecompany.com/machine_shop/
www.wallacecompany.com/E45/index.html
California, USA

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28 Feb 2010 12:33 #2111 by BigJohnT
Replied by BigJohnT on topic Re:Hardinge CHNC 1 Lathe
Kirk,

Thanks for the info on the turret encoder and for the offer to fix it. I might take you up on it if I can't figure it out LOL. I will peal the rubber off today and take a look see. How do you troubleshoot the parts? It was mighty wet in there when I took the cover off.

When I took the magnet off I noticed that there was not any key or any other means of lining up the magnet to any specific orientation. Is it just trial and error to get the magnet set so it will drop and lock at the right place?

Oh my and the turret comp is neat. Is it in 2.4? or did you add it locally? As many of these Hardinges that are out there it should be part of EMC I think if it is not all ready.

Thanks
John

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28 Feb 2010 14:09 - 28 Feb 2010 14:10 #2114 by BigJohnT
Replied by BigJohnT on topic Re:Hardinge CHNC 1 Lathe
I wooped some rubber-be-gone on it this morning and my board is the same but different :( than your board. I see a part that is smoked but can not id what it was . It is about 4 times the diameter of the resistors and tan colored in position C1. Any ideas what it might be?



Thanks
John
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Last edit: 28 Feb 2010 14:10 by BigJohnT.

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28 Feb 2010 14:40 #2115 by PCW
Replied by PCW on topic Re:Hardinge CHNC 1 Lathe
Looks like a Tantalum bypass capacitor
old Tantalum bypass caps are quite prone to this (shorting out)

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28 Feb 2010 15:15 - 28 Feb 2010 15:15 #2116 by BigJohnT
Replied by BigJohnT on topic Re:Hardinge CHNC 1 Lathe
Here is a closer shot of it. I can read 173+ then in the burned spot something ends with K.



Thanks
John
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Last edit: 28 Feb 2010 15:15 by BigJohnT.

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28 Feb 2010 15:26 #2117 by PCW
Replied by PCW on topic Re:Hardinge CHNC 1 Lathe
It might have some info on the back, I'd clip the leads and see. What power supply does this run on?
Bypasses are not critical so if the power supply is known the capacitor size can be guessed

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28 Feb 2010 15:48 #2118 by BigJohnT
Replied by BigJohnT on topic Re:Hardinge CHNC 1 Lathe
Hi Peter,

It runs on 24v.

It has the following on it
24V+
0.114 (2)
173+
The last line I can't read

Thanks
John

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28 Feb 2010 16:18 #2119 by PCW
Replied by PCW on topic Re:Hardinge CHNC 1 Lathe
24V is strange (25 is a standard voltage rating and too low for 24V power)

Unless you can get the original specs I would tend to be cautious and use a 35V capacitor, maybe 2.2 uFor so

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