Search:

I bought a bunch of stuff from Grizzly to fix the saw guides. Unfortunately the cam bolts were not in stock and the old and new parts have different sized bearings.

I can't imagine why this...

I have a Harbour Freight 4x6 horizontal band saw with a broken blade guide. The piece that holds the bearings split. I have not been able to find a replacement. Grizzly has them on their website...

I would just clean it and sell it. Maybe simple repair. Any money you put into it is most likely going to be lost.

I have one and it ran ok on the stock screws, the Z axis dovetail failed first!

I am in the process of starting a small puzzle making business. These are mechanical discovery or ball maze type puzzles made out of aluminum or wood. Expected tolerance is loose slip fit. I have...

Repair is on long-term hold. I was offered an RF-30 for free. I pick it up in a few months. Plan is to get the RF-30 cleaned up and running. Not planning on cncing it.

Once I have that working I...

I got the machine fully tore down today. Not good news on the Z axis ways. I found some scratched or galled surfaces on the gibb side. Slides smooth till you put a little pressure on it. then it...

Progress! Well more like 2 steps forward and another step or 3 back. I have some other machining I need to do and is fine with just setting and locking the Z axis. I don't have it back together...

I have an old atlas lathe I have to grind hss tools for. Just the typical day to day random hobby stuff, aluminum, steel, brass, and plastic. I'm still learning the best ways to sharpen bits for my...

I have seen that video, I don't see that replacing my other cutting methods. I was more thinking of sharpening or other things you would use a bench grinder for. I do remember seeing some one...

Got the new parts in today, I think the new ball screw will make a world of difference. If the original motor had a strait shaft I would have been just fine with it. It will take me a while to get...

I am in the process of rearranging my metal workshop. One tool I am trying to decide if it should stay readily accessible or move to once in a while needed storage is my old 14" 3300RPM abrasive...

I doubt the power-failure did any real damage. Usually those kinds of failures are more catastrophic. It could have caused some corruption of the firmware. I would consider an update or fresh...

I agree it's a software issue and not a mechanical one. Some things I would be looking at real close:

Where does the controller think Z 0 is before and after the failure point. Does anything...

Current ballscrew is 0.5 in lead or 2 turn per in. The belt drive is 2:1 so a total of 4 turns of the stepper per in of travel.

I ordered a 570oz stepper and a leadscrew with a.2in lead.

Sorry, I was referring to a 3rd party Gcode viewer. A couple of examples are ncviewer or CAMotics. I have not used them because all my CNC controllers have a preview of the Gcode. In your case I...

I did some more testing, the electronic side comes out fine. The DC resistance and current drive as measured with a fluke clamp on amp meter are the same for both phases and the same as the other...

I got the bearing assembly out and apart. Ball screw is straight and the nut feels good. The parts I made are another story. TIR at the pulley teeth and hub was .02"

The preload screws were not...

I agree everything in the system needs checking. It will be interesting to see how close I got.

When I made the parts I did not have a lathe and had never turned anything. I used the mill as a...

Have you tried to look at the gcode in a simulator? That would save some time and materials. It would also help identify if it's in the machine or the post processor.

I also noticed in the...

Just did some testing. Unhooked the counterbalance spring. Head moved fine under power. It added about 30 to 40 lb of down force at stall, about 150lb down total at stall.

Disconnected the belt...

One thing I have considered is that the Z assembly has about 55lb of spring counterbalance. I could reduce or eliminate that. IF that helps me to center up the ball screw and eliminate the friction...

I'm getting ready to order the new ball screw. Assuming the machine will still have high friction, would going with the .2 lead and changing to a 570oz-in stepper be too much? I would keep the 2:1...

Machined or not doesn't matter for me. I have a lathe that can cut it. All I have to do is drill and tap the end. The nut spins, not the screw.

How does this look? https://www.automationtechnologiesinc.com/products-page/ballscrews-nuts/1605-series-365mm-flanged-nut-and-screw

While I am installing it I will clean and inspect the ways. I...

So 300lb of friction does not sound excessive to you? According to the math I should be generating 400lb screw to head stock but only have 110 lb spindle to vice of down force.

It's even worse than that, its .5 lead, 2 start. so .25 pitch. https://www.applied.com/c-brands/c-nook-industries/sbn10113/PowerTrac-Standard-Rolled-Thread-Ball-Nut/p/101640711

So I should have...

I just tested with a scale and it skips steps at 110lb (50kg) moving 10ipm or .5 ipm. With the same scale I get about 3 times that on my drill press with out much effort. It also shows your...

Thank you all.

Peter. I am using 4 micro steps. My understanding is less micro steps reduces torque loss to micro stepping. Friction in Z is higher than I'd like. I use good way oil and that...

Thanks for the extra info. What I was thinking is the $29 get's me is going from 8.8mH and 2.1A to 2.2mH and 4.2A. If I'm understanding you right that 8.8mH with the low voltage is killing my speed...

Thanks Craig. If the rule of thumb from Gecko 32 * SQRT (L) = VMAX holds true that puts me at a 48V psu. 80V sounds high to me on such a motor. I don't want over the top speed at the expense of...