Power supply question for 3axis bopard

[NC Cams]

PM to BKUKOWSKI: Be careful of what can happen if/when you go to college.

They could indoctrinate your proven ability to learn and construct DIY electronic kits right out of you which you properly picked up by reading and experimenting.

Be ESPECIALLY careful if you go after a masters degree.

Although a particular degree (and Mythbusters) can explain how and why two pieces of metal, wire and a lemon will make a battery, the chemistry dept probably can't and won't tech you how to use or apply Ohm's law....

[HobbyCNC]

Originally Posted by tq9516pjm C'mon Dave, You should know what you sell. It was a kit. I bought it a couple months back. It says "Hobby CNC 4AUPC Rev2 unipolar Microstepping Copyright 2005" You must know what you sell. I am trying to get a power supply to it and do not understand why you the recommended the one you did. Yes, i feel 'unhelped' - can you help, please? Thanks.

Ok here is both barrels....
The "powersupply" that you say we recommend is a transformer that you say you bought. This is ONLY shown on the PACKAGE webpage. In over 4 years of this basic webpage setup you are the only one make this mistake.

Since you have not identified yourself I REALLY can't tell what you purchased from us.

IF it was just a driver board kit then the tranny is just a start. My post #4 above made over 3 weeks ago made a generous offer to you for an upgrade to all the parts to complete a system.

Our Yahoo group does indeed have a powersupply schematic that can use the tranny you purchased. Have you joined? PM me for a link IF you have not.

Unhelped? It has been over 3 weeks since your post and your reply to me. Any further "help" will be from our Yahoo group.

Dave Rigotti
HobbyCNC.com

[HobbyCNC]

Originally Posted by NC Cams Several things amaze me about the DIY CNC community. 1. People buy DIY electronic kits who don't know enough electronics to "do the math" when it comes to: a. learning how to do basic calculations needed to construct power supplies, size resistors, figure out wire size, whatever. Simple basic "earth science" level math stuff. b. Manufacturers make a sell kits that are poorly documented with recommended p/n's for the critical things need to make their kit work or to create what is needed to make it work. c. anticipate that the DIY'er can't do even basic electronics design mods to adapt this into that... When you understand it, its simple, when you don't, it is like trying to read a foreign language. d. Worse yet perhaps is that the manufacturers' engineers THINK for a minute that that the people will buy the kits are, first, educated enough to understand and do the math and, second, CAN and WILL take the time to do the math if they can. If you make any of the above assumptions improperly, you are overestimating the technical skills and/or education level of your potential client base. For those so inclinded, I've listed some links below that can be used by just about anyone who can "understand the math (wink wink" to size and create just about any size power supply that that they may need (if they pick the right components and proper sized transformer). Linear P/S design/construction: http://www.campbelldesigns.com/files...ply-part-1.pdf Hmmm seems I already offered this hence I must be guilty of failing to consider assumption "d." above. How stooopid of me.... The other option is for the kit buyer to buy a P/S from the kit supplier in the first place. In that respect, the kit supplier should have pre-engineered one PROPERLY in anticipation of the less technically competent DIY'er when they decided to build and sell their DIY widget. If the mfg didn't engineer their DIY kit properly and/or failed to recommend an off the shelf P/S properly, they deserve whatever grief they get. There's probably enough oversight to go around on both ends of the supplier chain in this instance - it usually works that way.

To whomever you are......

I find most people want to be helped when asking for it. BUT, in some cases, some just want to complain.

Dave "I sign all my posts" Rigotti
HobbyCNC.com

[NC Cams]

Just trying to be fair, I merely pointed out a number of options that, if the shoe fit........

As a former supplier to the DIY market (never again), I know of the issues that you deal with and also know a lot of technical folks who don't interface well with the retail crowd - they know too much and the customers know too little.

However, since the member who ALLEGEDLY had the problem has/had a self proclaimed masters degree and "could do the math", I merely figured that he could figure out which solution best fit his needs.

That was as "civil" as I could keep it (pursuant to the useage dictums of the M/B) and still be constructively critical of someone who was clearly more interested in b+tching than being helped. T'were it me, I'd find out who it is, send him his money and tell him to go elsewhere - life it too short to deal with some clients...