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And how has that worked out? What was needed? I'm guessing at least a small R on each output to balance the currents?

Gary

Just curious. I don't see any mounting holes. How is this board intended to be mounted? I'm guessing, mount to the heatsink and hang the board off the chip? (Is there a mounting hole hiding in the...

My shoulder problems that I mentioned over a year ago didn't go away without surgery, and while I was at it I had both ankles done too (another chronic problem). Much better now and itching to get...

Like I said, haven't been here in awhile, looks like now everyone is ga-ga over 5-start leadscrews. I've updated the parts list to include those.

I have family near Seattle, Suquamish. But the...

I haven't been around here for awhile, but a couple of years ago I made up a parts list. I just looked at my copy of it and updated the links and prices. I think all the other earlier errors in it...

Though I haven't seen one, I've glanced at the EZ pics too. Unfortunately the key bits that would be missing would be the FET transistors that switch on the current reduction (Q2, Q4, Q6, Q8). Pin 17...

I'm really glad to hear that this has worked out for people. Ironically, other than the initial testing, I haven't been able to use it myself. I injured my shoulder almost a year ago, doing the final...

But then I just noticed that Vectric is in the UK; sorry GW.

GC

Are these the same as the v-groove wheels from IMService here:
http://www.cadcamcadcam.com/index.asp?PageAction=VIEWPROD&ProdID=107

If so, how do the prices compare?

Gary

You'll note that at the time of my last post in December, I was doing the 'tedious' job of installing the t-trak and spoilboard. Well in doing that, along with moving junk out of the garage earlier,...

What, you mean it works? I was just joking...

Gary

oops again, just remember, I'm not a woodworker and don't have a clue. I got away with it (so far) because I was working from a Joe-cut kit, and the fit on everything was fabulous. I was using...

Oops, I didn't staple, brad, or nail anything. Glue & clamps only.

Gary

What kind of bit is that?

Gary

Looking through the HCNCP instructions and the Allegro SLA7078 data sheets I noticed something curious: There are additional step modes available that aren't mentioned in the HCNCP instructions.
...

Found the 1/4 MDF at Home Depot in the shelving section, 4x8 sheets. It has a vinyl coating on one side that can be easily stripped off. The side under the vinyl is not as smooth as the normal MDF...

MODIFYING THE HOBBY CNCPro DRIVER BOARD TO USE MACH3 CURRENT CONTROL

Before I can suggest anyone try this modification, conscience requires me to fully explain the background and logic behind it....

Installed my t-track, very tedious: mark 80 screw locations; pilot drill 80 screw locations; install 80 screws. Then I slotted a sheet of 1/2 MDF to fit around the t-track. I mostly used the router...

Pics:

almost done - that's the t-track sitting there, ready to build up the hold-down/cutting surface.
mounting a dial indicator is easy - getting ~+/- 15 mils right now, measureing over the...

Got two coats of Minwax Stain+Polyurethane stuff on the legs, probably spent $10 in electricity to keep heaters running in the garage all weekend to keep the temperature up enough for it to dry. I'm...

In the HobbyCNC board, the sync function and current reduction are tied together, and operate off of the same timing circuit. Current reduction reduces the motor temperature, and sync reduces the...

The board would be pretty easy to modify to use the current reduction output of Mach3 to control both the current reduction and sync. I'm going to give that a try just as soon as I get my table...

Unbolt & lift. The x-box isn't glued to the legs. I'll lift it out and set it back on sawhorses to install the rails and gantry, then set it back in place (at least I -hope- I can lift it). My...

First thought was 4x4 legs and 2x4 cross pieces. Whack it together. I always knew I'd have to do something since I don't have a sturdy table of any sort to set the x-box on.

Bought the 4x4's and...

This is my todo list from three weeks ago, and what's been done since then:

buy, cut, and attach the x-box skins. done.
prime and paint x-box. > one coat, needs one more. done.
buy and cut...

DeWalt wins the uphill-in-the-snow-both-ways award.

Gary

Kinda looks like each cut is undersize by ~38 mils on a side, making the total on each figure a really consistent error of 77 mils. Looks like the cutter diameter is actually smaller than you think...

That's not that far from the truth. If you look at the past pics, you'll find that parts were built variously in my bedroom, living room, and dining room, with temp storage in another bedroom. Only...

Heh, I would've but there's so much oil & crud there already, I figured the white could only be an improvement.

Gary

Attached the second skin to the x-box; all of the gluing is now done. With my 48" level, the box surface came out as absolutely flat as I can measure, in every direction - way cool.

Finished the...