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Messages - Lob0426

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BenCutLaser / Re: Makeblock - LaserBot (OPEN)
« on: Today at 03:02:02 PM »
Good news

BenCutLaser / Re: Makeblock - LaserBot (OPEN)
« on: March 26, 2017, 06:46:30 PM »
Sound like you are making progress Ralph!

General Discussion / Re: Is this the z-axis we've been looking for?
« on: March 25, 2017, 11:54:23 AM »
That worked on mine also!

BenCutLaser / Re: Makeblock - Laserbot (OPEN)
« on: March 25, 2017, 11:53:37 AM »
I think marlin only accepts metric. So the software has to convert to metric if inches is used. My 3D printers use Marlin and everything I can set is in metric. So the software probably sends everything in metric to the firmware no matter the chosen measure units.

BenCutLaser / Re: Makeblock - Laserbot (OPEN)
« on: March 25, 2017, 11:13:30 AM »
So makeblock uses their own flavor of marlin.

General Discussion / Re: Is this the z-axis we've been looking for?
« on: March 25, 2017, 10:45:12 AM »
Please explain how to use the square to align. Mine is off enough that multipass cutting is generating wide angled slots.

A machinist friend has volunteered to mount a mirror on a 45 degree cut in a rotating vertical shaft. Idea is to shine the laser onto the "exact" center of the shaft and measure the burn on a circular wall. X+, Y+, X- & Y- should all be the same if it is vertical. Hoping that there is a math algorithm to evaluate the results and compensate for the beam not being dead center.

All of this needs to be done on a flat work space! You need a square and an accurate measure.
First remove the gantry. Then use the square to make sure the frame is flat and all corners are 90 take the feet off. Then make sure all the feet are touching and the table and is the same height at all corners. Use the square to make sure both gantry sides are 90 to the X axis beam, you need to loosen or remove the lower wheels. Now make the X axis beam vertical. Set it on the table and make sure it is sitting flat. Then use the square. You will be testing this beam again for vertical after you remount the gantry. At this point you will reinstall the gantry, everything should be straight and level to the work top. Check the X axis beam again and see if it is still vertical. Now check both ends of the beam and make sure they are the same height from the work top. Now you are finally at the point of adjusting the laser module. Put your square on the front of the module to see if it is vertical. Now put your square on the side of the module and make it vertical. Your machine is now mechanically true. The only place it can be out now is if the beam out of the module is not square to the module body. Or the lens is wobbling.

The only way to test laser beam true is to cut at several different heights and compare the cuts to each other. That will tell you if the beam is not true to the module body. Another test might be to dismount the module and set up several pieces of paper at different distances away from the module. Then burn through the papers and see if the beam is straight out from the module.

BenCutLaser / Re: Makeblock - Laserbot (OPEN)
« on: March 25, 2017, 10:14:22 AM »
Try M2 that is the end command on my CNC and I looks like Marlin supports it. M30 tells marlin to delete a file from the SD card.

BenCutLaser / Re: Makeblock - Laserbot (OPEN)
« on: March 24, 2017, 04:55:20 PM »
I think they may convert units within the software before it is sent to the controller. You choose either metric or inches but only metric values are sent.

I know that my 3D printer with marlin only accepts metric values in its EEPROM. I never checked to see which values are actually sent. I suspect only metric. My CNC accepts either inch or metric and requires that the "header" designate which is used. I know as I have mixed and matched units by accident and it never ends well!

BenCutLaser / Re: Makeblock - Laserbot (OPEN)
« on: March 24, 2017, 04:26:57 PM »
Marlin hangs if you try to send G20 or G21.

So, your answer is: G20 and G21 isn't supported at all. MM is always ON.
That is what I think is going on.
Marlin appears to be totally metric unless you make changes. So BCL will have to send metric units after converting from English units. You will have to strip the units selection, G20/G21 from your header when sending to a marlin machine.

So I am guessing that you might move forward by setting BCL to mm and strip G20/G21 from the header by hand and see if it works. You should be able to see parameters by using M500 in a terminal. You can change most parameters by changing manually then send M501 to store the settings.

BenCutLaser / Re: Makeblock - Laserbot (OPEN)
« on: March 24, 2017, 03:08:37 PM »
It will be G21, Millimeters. So when you (BCL) work in inches it will have to be converted to millimeters when sent. Probably no word for it at all it just defaults to millimeters. When you send inches it is the wrong format and marlin stalls. Just my guess.

BenCutLaser / Re: Makeblock - Laserbot (OPEN)
« on: March 24, 2017, 11:40:12 AM »
I think you send G28 to perform a homing operation.

You would send G28 before your gcode starts and after your header. Or send G28 in a terminal.

Trouble Shooting / Re: Parts break loose from bed after 1 inch
« on: March 24, 2017, 11:32:54 AM »
Make sure your bed is clean. I always wipe down the bed with alcohol. Does not matter if it is covered with kapton or blue tape. This removes oils from your hands from the surface.

As your print gets taller the heat source gets further from the bed. As the bed temperature drops prints tend to release from the bed. Your print bed is pretty thin so it looses heat pretty quickly.

Make sure you do not have any air drafts blowing crossed your printer. Put up a cardboard shield around it to keep warm air around the printer.

General Discussion / Re: What's the advantage to limit switches?
« on: March 21, 2017, 07:46:07 PM »
Home switches position your machine at 0,0 accurately.
Limit switches stop your machine from running to the end and grinding.
Home/Limit switches can be the same switches.

Home switches are at 0,0; Limit switches are at the other end of the X and Y, Z if you have made it moveable. So the Limits would be at your maximum, really just short of, travel. After the homing cycle your machine will treat any of these switches as a limit. If a switch is hit then the machine will come to a halt, turn off the Laser and go into an alarm state. Hard Limits must be enabled for this to work ($21=1).

described here;

Folgertech / Re: Slow customer service
« on: March 20, 2017, 08:47:32 PM »
XT60will handle the load!

General Discussion / Re: Is this the z-axis we've been looking for?
« on: March 20, 2017, 02:04:42 PM »
They do not state a weight.

Cutting is at relatively low speeds. So the inertia is low. You might just counter weight it. No real good solution.

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