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Hi Bluenone,
I've actually only used manchester encoding once myself in a radio link, But i've been aware of it for a while.
OK I think your HDLC + Manchester looks promising.
If I look at my...

Hi Bluenone.
OK I see you found the wikipedia entry for manchester encoding?
Manchester code - Wikipedia, the free encyclopedia

With most synchronous data transmission methods , you would...

Hi Bluenone.
Some excellent sleuthing on your part.
The data does look to be manchester encoded.
Seems to have a clock frequency of 4MHz so a "baud rate" of 4MHz too
(The 125nS is for 1/2 of bit...

Hi Bluenone.
You have almost got the baudrate calculation correct, but you can't enter "1.5" into the divider register. It must be an integer.
so your options are 10MHz:SPBRG=0 20MHz:SPBRG=1 ...

Hi Bluenone.
I Initially used a small USB logic analyser to look at the signals, it has a neat feature whereby it can emulate a UART , I basically connected the wires , then fiddled with sample rate...

Hi Bluenone,
I haven't had any time or opportunity to progress this any further.

The encoder appears to use an ASIC rather than a FPGA , this means Mitsubishi would have invested a fair amount of...

Hi Dm1try,
Thanks for your information.
I picked up 8 of the KFS23 with ballscrews and couplings off Ebay about a year ago. The deal included two of the MR-J2S-70B even though they were known to be...

Hi Guys.
This thread is a bit stale , but.
I also have some IA actuators (off Ebay :D), but mine have the standard quadrature encoders on. (They are really neat bits of gear!)
I've got them...

Hi Outlander,
Sounds like the Blueprint approach would be ideal , I'll remember that for myself later.
If you get a choice , pay a little more for "vellum" or "onionskin" rather than paper as the...

Hi .
I have a similar need, But was thinking more along the lines of having a fairly thin table, that pivots vertical for storage, you then store it next to your stock of 4' sq metal. It would only...

Hi RASPNC ,
You need to find a retired machinist who has a home workshop.
I know of a guy here in Newcastle, and another in Warwick. But you really need a guy close by, as you will need to interact...

re Deflection of 2x12mm vs 1 x 3/4":
For most regular sections (circular square hexagon etc) the moment of inertia, and the stiffness goes as the 4th power of thickness.
So from my machinery's...

Hi ,
I'm an electronics engineer with 30+ years experience. The other posters are correct, the light pen relies on a the flying spot of light that paints the CRT screen.

LCD screens are...

Hi , Just some additional comments:

(a) You first need to look at your requirements, the PID implementation here may be more than you need. Figure out how much mass you are trying to position, how...

============== KL7212 Power supply lifetime calculation =========
OK for the curious , I will do a worked example of a lifetime calculation.
(a) assume capacitor is the life limiting component,...

Dan has raised a good point,
If you can find some perforated sheet you can make a box out of this and rely on passive ventilation. I've found a photo of the KL7212 now, It is built on a shallow U...

Ahh ,
Here's some numbers, courtesy of Google, see http://www.nidec.com/aircooling/fantech.htm
about 0.6watts per cfm per deg, so with an average 80mm fan at 40cfm, and 86watts, the exit air will...

I'm not familiar with the power supply you mentioned, but power supplies are typically 90% efficient, so you will need to dissipate 86watts at full power.
You can actually calculate the air flow...

Hi Joe
Depending on your accuracy requirements, you may be able to use something as simple as a short piece of 1/4" fuel hose (rubber type with fabric reinforcement) , this is best secured with...

Following on from the other posts:
There's another particular issue with stepper motors due to resonance, which requires your coupling to have some type of cushioning, so rubber timing belts are...

oops, cut off a sentence.

* the DC voltage reading is the most accurate reading from a multimeter, (most multimeters have dubious AC measurements).


BobT

Hi Tajord
I hope you find the response of the forumists helpful, the "awright" persona has contributed a lot of useful information. I can hopefully extend on this a little.

(a) Rewinding a...

Hello All,
I've stumbled across an alternative form of magnetic rotary encoder.
All you need to do is glue a magnet to an end of your shaft and position the encoder next to it. The magnet costs...

I have included some pictures of my bot so far. It's made of plywood, as it's really a development platform at this stage, once I get dimensions and geometry right I'll cut parts from aluminium sheet...

Hi Higgs,
Interesting proposition using car valve stems, But there are 2 major drawbacks:

(a) The valve stem diameter will be some odd size, so you will need to make your own bushes to some odd...

Hi Guys
This website is pretty impressive, thanks for the tip! ( http://truetex.com/servomod.htm )

And if you were a real cheapskate, you could always salvage the optical encoders out of...

Hi Higgs,
As both the 48W and the 100W have nearly identical emf constants ~100rpm/volt they will be essentially interchangeable.
As Al mentioned above the current required is purely a function of...

Hi Higgs.
Your existing driver may well work with the cheaper motors,

But note there is more than one way to make a 100w motor!
you have a motor rated at 100v and 1amp (e.g. a typical...

Hi Higgs,
These look like Oatley Electronics type SC500 motors (www.oatleye.com) are you sure they are brushless? Looks more like they are permanent magnet type (PM motors have two wires red and...