An open source Emco 120P lathe tool turret control

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18 Apr 2016 13:41 - 18 Apr 2016 14:54 #73532 by LutzTD
thanx

yes thats right, I forgot to transfer the info down.

I have 10 bare boards coming because that was the cost structure of the board house. I was going to try to build 10 and share those at a little over cost to recoup some of the costs for my PCBA but some of the parts are quite expensive so likely I will get 2 sets of parts and that way I can practice and maybe have a spare. So if someone wants a board I will have some available, I may buy the small discretes for all 10 but the connectors and the driver likely not.

this sounded terrible :). not trying to make money. The bare boards were $41/10, the place was minimum 10, so If someone wants a bare pcb then I will be making 5 available immediately for $5 sent in a 1st class envelope (should be safe).
Last edit: 18 Apr 2016 14:54 by LutzTD. Reason: added pass on cost

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18 Apr 2016 13:41 - 18 Apr 2016 13:44 #73534 by tome
Scott,
In looking a little closer there is one change you should make to the information I gave you, and I should clarify something regarding C6 and R4.

C6 should be 2200 pF (0.0022uF). This is assuming you are using a 20k ohm resistor for R4. The pin on the driver chip that these two parts are attached to labeled "RC" creates a timing circuit. Use EITHER C6= 0.0022uF and R4=20K ohm, OR use C6= 0.0033uF and R4=15K ohm. We used the latter because that is what we had lying around.

This would also apply to C5 and R3 but you have the correct values for these in your BOM.
-Tom
Last edit: 18 Apr 2016 13:44 by tome.

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18 Apr 2016 14:13 #73535 by LutzTD
I updated it and moved the 3300pF below with your note. Dropped the price columns because those are only good right now anyway. the part numbers are there for anyone to re-price later
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18 Apr 2016 15:05 - 18 Apr 2016 15:05 #73539 by tome

this sounded terrible :). not trying to make money. The bare boards were $41/10, the place was minimum 10, so If someone wants a bare pcb then I will be making 5 available immediately for $5 sent in a 1st class envelope (should be safe).


Nice of you to make them available. Making the board is really the primary barrier to someone using this solution. Getting/soldering the parts is easy enough. Now you will be flooded with requests from all those people out there retrofitting EMCOturn 120's :laugh:

-Tom
Last edit: 18 Apr 2016 15:05 by tome.

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18 Apr 2016 15:43 - 18 Apr 2016 15:43 #73542 by LutzTD
yeah its only fair, it was your design and hard work after all. Ill post when they are gone.
Last edit: 18 Apr 2016 15:43 by LutzTD.

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19 Apr 2016 15:37 #73601 by tome
Actually, I wouldn't mind getting one of those boards. Would be good to have a backup. Let me know if that's possible and I can paypal you...
-Tom

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19 Apr 2016 16:24 #73604 by LutzTD
IM me your address, Ill send you a couple for free.

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19 Apr 2016 20:09 - 19 Apr 2016 20:11 #73614 by LutzTD
woohoo pcb's arrived today



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Last edit: 19 Apr 2016 20:11 by LutzTD.
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19 Apr 2016 20:41 - 19 Apr 2016 20:41 #73615 by tome
Look nice! I sent you a message (I think - may have been sent twice actually)...
-Tom

ps: where did you get them made?
Last edit: 19 Apr 2016 20:41 by tome.

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20 Apr 2016 01:00 #73625 by LutzTD
I'll send a board out tomorrow. I got them from a proto house in China, they turned them very quick. www.pcbgogo.com/ stateside sources were 10X, much as I would have liked to get them made here in the US the price is prohibitive.

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