Re: [Emc-users] Pic a servo

Thanks for that. Something to chew on for a few weeks.. Regards Roland Jollivet 2008/11/21 Sebastian Kuzminsky <[EMAIL PROTECTED]> > Stephen Wille Padnos wrote: > > Roland Jollivet wrote: > > > >> Hi > >> > >> If we look at HM2_7i43, > >> where can I find documentation on the actual read/write

Re: [Emc-users] Pic a servo

Stephen Wille Padnos wrote: > Roland Jollivet wrote: > >> Hi >> >> If we look at HM2_7i43, >> where can I find documentation on the actual read/write sequence to the >> parallel port, and a map of the registers? >> >> > You could look at the source code. It's even available on the web. (at >

Re: [Emc-users] Pic a servo

Roland Jollivet wrote: >Hi > >If we look at HM2_7i43, >where can I find documentation on the actual read/write sequence to the >parallel port, and a map of the registers? > > You could look at the source code. It's even available on the web. (at ) The HM2_7i43 is a

Re: [Emc-users] Pic a servo

Hi If we look at HM2_7i43, where can I find documentation on the actual read/write sequence to the parallel port, and a map of the registers? Regards Roland Jollivet 2008/11/20 Sebastian Kuzminsky <[EMAIL PROTECTED]> > Roland Jollivet wrote: > > Yes, I was looking at most of them, but I suppo

Re: [Emc-users] Pic a servo

Roland Jollivet wrote: > 2008/11/21 Jon Elson <[EMAIL PROTECTED]> > > >> John Kasunich wrote: >> >>> Jon Elson wrote: >>> >>> John Kasunich gives an excellent response, but didn't mention connectors. >>> Actually, I did, in some detail: >>> >>> >>

Re: [Emc-users] Pic a servo

heh I used to work for one of the UK kit suppliers and I know the support problems only too well, glued instead of solder, random part orientation, mains accross the tracks, my job was phone support and fixing kits for a fixed fee. Dave Caroline ---

Re: [Emc-users] Pic a servo

Having been involved in the past with a low-end hardware business, I echo Kent's thoughts. It's a horrible business to be in - slim profits (if that) and lots of tech support. I have a HobbyCNC board and I'm on the HobbyCNC list. The owner of that business sells the boards unassembled to reduce

Re: [Emc-users] Pic a servo

Gentle persons: I'm hearing echoes of a 30-year old story that a contributing editor of one of the early microcomputing magazines (maybe Kilobaud) told. He got a wild hair to make a simple interface card and sell it. His tale of woe can be boiled down to "I was losing money on every sale." What

Re: [Emc-users] Pic a servo

A lot of the dspics can be got from Farnell just up the road in Leeds Dave Caroline - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & w

Re: [Emc-users] Pic a servo

>Jon Elson wrote. If the $100 is for a home-made milled PCB you put together yourself, it is quite possible, but that will take a lot of time to make the board, assemble and debug.> That's fine for a commercial unit Jon but I'm sure I'm not the only person who would love to find an open so

Re: [Emc-users] Pic a servo

2008/11/21 Jon Elson <[EMAIL PROTECTED]> > John Kasunich wrote: > > Jon Elson wrote: > > > >> John Kasunich gives an excellent response, but didn't mention > >> connectors. > >> > > > > Actually, I did, in some detail: > > > Agreed, you definitely did mention at least one, specifically! But, a >

Re: [Emc-users] Pic a servo

John Kasunich wrote: > Jon Elson wrote: > >> John Kasunich gives an excellent response, but didn't mention >> connectors. >> > > Actually, I did, in some detail: > Agreed, you definitely did mention at least one, specifically! But, a multi-axis servo control will have multiple connect

Re: [Emc-users] Pic a servo

Jon Elson wrote: > John Kasunich gives an excellent response, but didn't mention > connectors. Actually, I did, in some detail: >> There is a minimum cost for just about any electronic "thing" made >> in small quantities. It comes from the bare PC board, cables, >> connectors, bypass capacitors

Re: [Emc-users] Pic a servo

Roland Jollivet wrote: > Hi > > I have been wondering the last few days on an 'open' data format for > controlling low cost, user built servo's. > > The scenario of using a 'proper' closed loop servo for a small mill is very > appealing over a stepper. > While parallel ports are almost free and su

Re: [Emc-users] Pic a servo

On Thu, 20 Nov 2008, Roland Jollivet wrote: > Date: Thu, 20 Nov 2008 21:46:43 +0200 > From: Roland Jollivet <[EMAIL PROTECTED]> > Reply-To: "Enhanced Machine Controller (EMC)" > > To: "Enhanced Machine Controller (EMC)" > Subject: Re: [Emc-us

Re: [Emc-users] Pic a servo

Yes, I was thinking of this too. The option is make your own PCI card. One can get away with simple adressing, and doing away with the 'plug 'n play' side of things. Imagine, a PCI card with dip switches! Otherwise use a generic PCI chip like the Tiger 320 or PEX8311. The thing is, why develop a

Re: [Emc-users] Pic a servo

>> There are several systems along these lines that already exist: >> pico-systems ppmc, mesanet.com's 7i43, and pluto_servo all use the EPP >> protocol for this purpose, and each one has established its own protocol >> details. Isn't the parallel-port going the way of the Do-Do pretty soon? I rem

Re: [Emc-users] Pic a servo

Hi Ian As I said, although it needs more thought, the hardware would mostly consist of a Pic, a IR2184 bridge and some FETS. The code could be ported to the Pic of your choice. The real difficulty is that such hardware would be difficult to test without the EMC side. The pic would just be transl

Re: [Emc-users] Pic a servo

Roland Jollivet wrote: > Yes, I was looking at most of them, but I suppose the data format is not > trivial, as it's adressing FPGA's. I would also think toe's would be stepped > on if one tried to piggy-back someone elses format. Mesa's HostMot2 protocols and FPGA source code are all open source

Re: [Emc-users] Pic a servo

Hi Jeff Yes, I was looking at most of them, but I suppose the data format is not trivial, as it's adressing FPGA's. I would also think toe's would be stepped on if one tried to piggy-back someone elses format. Regards Roland Jollivet 2008/11/20 Jeff Epler <[EMAIL PROTECTED]> > There are severa

Re: [Emc-users] Pic a servo

Thanks John I knew you'd give a comprehensive reply. Notwithstanding, many hobbists build their own stepper drives. There's a plethora of them. So now now it's open loop. Otherwise cobble your own Step/Dir drive. Got closed loop, but two of them that meet in the middle. If you want to build your o

[Emc-users] Pic a servo

>Roland Jollivet wrote... I have been wondering the last few days on an 'open' data format for controlling low cost, user built servo's.> I would be interested - I have been trawling the 'net for a while now looking for exactly this kind of project - one that I can make myself and which won't

Re: [Emc-users] Pic a servo

There are several systems along these lines that already exist: pico-systems ppmc, mesanet.com's 7i43, and pluto_servo all use the EPP protocol for this purpose, and each one has established its own protocol details. There's also this project, though I'm not sure of the state of it: http://fenneti

Re: [Emc-users] Pic a servo

Roland Jollivet wrote: > Hi > > I have been wondering the last few days on an 'open' data format for > controlling low cost, user built servo's. Interesting project - my comments are interspersed > The scenario of using a 'proper' closed loop servo for a small mill is very > appealing over

[Emc-users] Pic a servo

Hi I have been wondering the last few days on an 'open' data format for controlling low cost, user built servo's. The scenario of using a 'proper' closed loop servo for a small mill is very appealing over a stepper. While parallel ports are almost free and sufficient for steppers, to implement a