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Number 40 or 50 roller chain might work fine too.

I couldn't remember so I just went and checked.

Does this look familiar?
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Here's the (not super clear) view in the CPU cabinet on the back:
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Looks like I just added the VGA...

Hah, your mill monitor setup looks almost exactly like ours, although we don't have the extra box in the middle.

When our monitor failed a bunch of years ago, I found an alternate solution. I...

Nicely done, Jim. I take it that the O.D. of the nut runs happily on the roller bearings. Did the nut body need any work to match the roller bearings?

The opto-isolators should protect the parallel port but there is still the problem of conflicting signals coming from the port and the handheld jogger.

There must be some one who makes a thing-ee...

The BOB doesn't create the STEP/DIR signals. They are created by Mach3. All the BOB does is make them more accessible, and add some isolation, than you wiring directly to the parallel port plug. The...

Use your entire shop air system as the reservoir. 1 1/8 bore is a 1.25 multiplier (roughly.) So 90 psi in a 1 1/8 cylinder gives about 112 pounds of force.

Unless you have some crazy fast up-down...

Is a compressor really that big of a problem? Using air cylinders solves so many problems. End stops for precise positioning are just screws, diameter of air cylinder (and regulators) easily set the...

Six plates like that seems reasonable as long as you can ensure a flat even base for the linear rail to sit on. If you can roughen the mating surfaces and bond the parts together that would be even...

Indeed. Hopefully you can bolt it to the floor.

No, side bolts _may_ not be necessary. It just depends on how good a fit you can get between the pucks and the cross tube inside. For extra...

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Cross tube/vertical post junction. Tie rod in green. Blue puck must be securely bolted to vertical post. Perhaps assemble the parts with fasteners fairly snug, lay it on your beautiful ground...

Somehow I find that upper cross tubes/back plates/diagonal structure ... disturbing. It doesn't give me a gut feeling of sturdy. But without welding, I'm not sure what would satisfy my gut. ;-)
...

Can you take the vertical side posts all the way down to the lower frame cross members with suitable spacers to clear the edge of the table surface?

ONE PART to connect the mpg and the ULN2003? With no programming? Unlikely.

A 74xxx193 and a 74xxx138 might do the job, but could suffer from dither drift. ("xxx" could be "LS" or "HC" or...

That link was not put there by iwaskevin. The forum software adds these (sometimes annoying) links by itself as a way of helping to pay for this site so we can have a place to come and complain about...

If there is back lash between the servo motor and its encoder, it is not going to work very well. There will be some very nasty oscillations and overshooting.

How does the viscosity of the water+xanthan gum+air change with shear? Some non-Newtonian fluids, like blood, get thinner with shear. Others, like corn starch in water, get thicker.

The flow rate...

Indeed, tearing into something like GRBL is no where near trivial. I expect there are many thousands of hours of development time in it with very intricate knowledge of the AVR processor it is...

Any driver with STEP and DIRection inputs will work fine with the Arduino. Life will be easier if all the signalling works at 5 volts. One of those LCD/button shields is easy to use for the user...

Try Amre Supply for the same thermostat as at Zoro. Only twice the price but already in Canada.

Do you need controlled rotation of the spindle or just rotate to and stop at a particular angle.

If the VMC has a tool changer then it can orient the spindle. At least some machines allow G-Code...

Are there jumpers under the A4988 boards to change the microstepping mode? The default might be 1/32 microstepping, so change the jumpers for 1/16 (double speed) or 1/8 for quadruple speed.

However, the light bulbs will suffer from inrush current problems too, precisely because they have lower resistance when cold and higher when hot. So they are not great as in-rush protection.

This...

No, the load will still be 100 watts.

The resistance of 100 bulbs in parallel will be 1/100th the resistance of one bulb.

Add light bulbs in parallel until the breaker current is reached. Put...

I would stick with the solid motor coupling to start. You appear to only have thrust bearings on the ball screw, and no radial bearing. At 13:13 of video 6, you can see the end of the ball screw...

The alternate bearing you found: 312494 is also a self aligning bearing, just using a 2 part (2 mounting hole) stamped shell instead of the cast iron piece of the previous version. (If you look...

Since your loads aren't very high, you could perhaps change the 'precision' shaft to a cone and a bolt. The big size of the cone must be bigger than the hole through the bearing. This will center...

Some filtering turns the PWM into an analog value. Then one (or a few) op-amps can amplify, invert and offset the 0 to 5 volts to 10 to -10 volts.

The trick though is getting a sensible output...

Just a single resistor, somewhere in the range of 4K7 to 10K.

Since your sensor is 4 wire with both NO and NC outputs, you should be able to get whatever output signal polarity you need by...

When I have connected NPN sensors to microcontrollers, I have used (essentially) only a pull-up (to 5 or 3.3 volts, depending on the equipment.) The open drain sensor acts like a switch to ground....