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07-12-2016 #11
Hi Neale,
Thank for the diagram. Very, very handy.
Yep, the instructions for the BoB are terrible! But I'm pretty sure from your diagram and Jazz's description of the system I will be able to figure it out without too much trouble.
As for the version of Windows, I am going to source a 32bit verison of Windows. I was going to go with Windows 7, unless you think a later/earlier version is better suited to the job?
Thanks again for the help. I think the BoB was causing me the most confusion but I think I got it now!
Rob
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07-12-2016 #12
Win7 is the latest that came with a 32-bit version, I believe, so that's the one to go for. Probably the best and most stable version of recent years as well.
- Dr Brian (well, everyone else is boasting about it...)
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07-12-2016 #13
Well what a coincidence...I am a Bristol Uni Alumnus. Did my doctorate with Drinkwater and Wilcox on the Ultrasonics team.
Just supplied special bit of 3D printing kit to a chappy in the aerospace department too
If you are one of those that works late, I could pop over and have a chat tonight even. Drop me a private message and we can go from there.https://emvioeng.com
Machine tools and 3D printing supplies. Expanding constantly.
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07-12-2016 #14https://emvioeng.com
Machine tools and 3D printing supplies. Expanding constantly.
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07-12-2016 #15
Thank you Jazz,
I think with your explanation (much clearer than a lot of info I have found online) and the one from Neale has clarified things immensely to be honest.
I was having a little play with the BoB today and with a meter I could see the voltages coming out of some of the pins (not quite 5V but 3.6V, which may either be normal or it's because I have had to use a PCI expansion slot in the PC as it didn't come with a parallel port). My next step is to get a dedicated PC assigned for the job, install Win7(32 bit) and then install Mach3. Then I think I will be on the home run!
Thanks again for saving me a lot of hair-pulling.
Rob
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07-12-2016 #16
Possibly because of the PCI. It's very common for modern PC's to only supply 3.6V. However this is BAD NEWS for CNC and you need close to 5v to work correctly.
With 3.6V you will have trouble because there isn't difference between HIGH and LOW.?
When I said 0v and 5V I actually should have also said LOW & HIGH because that what really matters to CNC. LOW is anything from 0v to 2.5v HIGH is anything thing from 3.1 to 5V.
So with only 3.6v there not enough difference between Hi - Low signals and just slight difference or drop in voltage can cause missed steps and all sorts of strange happenings.
Only letters could put after my name are "NFC" or "CFS" but Hope that helps expalin little more.Last edited by JAZZCNC; 07-12-2016 at 08:27 PM.
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07-12-2016 #17Only letters could put after my name are "NFC" or "CFS" but Hope that helps expalin little more.
So with only 3.6v there not enough difference between Hi - Low signals and just slight difference or drop in voltage can cause missed steps and all sorts of strange happenings.
Last edited by Clive S; 07-12-2016 at 10:20 PM.
..Clive
The more you know, The better you know, How little you know
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07-12-2016 #18
That BoB is a Larff innit ! £16 for a D25 to screw terminals connector.
A chinese 5 axis BoB will do isolation, spindle control, coolant relay all for a small Bank of England drinking voucher. I wouldn't put that connector board anywhere near my computer (apart from the bin next to it).
Cheers
Rob (if you want the letters behind my name it's 'F. in B.;VD and scar')Last edited by cropwell; 07-12-2016 at 11:41 PM.
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