Here are some things I’ve done in the past couple of months.
Most notably, however, I have replaced the old linear actuator system on the x-axis with this stepper and belt from an old scanner I found in the alley. I didn’t really want to do it at first because it’s a unipolar motor (6 wires) as opposed to a bipolar motor (4 wires) like the old motor. A unipolar motor can be turned into a bipolar motor simply by not using the two COMMON wires. I thought it would be a pain in the ass to find the Common wires as well as find the coil wires and group everything together correctly. Then I realized the Common wires were both Brown. So that was easy.
And as a bonus, the motor came with its own mounting bracket!
That 3/16″ steel rod you see in the back will either be replaced by a 3/8″ aluminum rod in the future or have a partner right below it to stabilize the carriage.
Notice how far apart the y-axis bearings are. I expect this to be much more stable.
Belt tensioners on Thingiverse:
That’s it for now. I have to go to work.
Seems like it’s been a really long time, but it’s only been a couple of months since my last post.
So let’s get up to speed:
I ordered two laser diodes but only one came in. I didn’t take the initiative to contact the seller/s because they appear to be a gigantic factory in China and they’re dirt cheap. So I’ll just order another one if/when I need it. I’d like to get a box of several spares but I don’t know if that will be possible unless I land on some disposable income.
I took the old diode out of the Aixiz module (The process involved a hammer. It wasn’t pretty) and put the new 808nm 300mW diode in, which was a little tricky. I had to use a vice and a piece of wood with a hole drilled in it to protect the pins.
The diode is an open-can model, unlike the old one. This requires a little more care. Can’t allow dust and debris to get in there.
At the moment, I don’t have a good way of testing the diode. The beam is not visible to the naked eye and I don’t even have appropriate safety glasses yet. It also seems that none of the leads are connected by conductive material. I’ve tested it with the ohmmeter and I don’t get a response. I don’t think this means the diode is broken, but it seems odd to me.
I need a driver. The laser has an operating voltage of 2.2V and is rated at 300mW. That means it needs about 2.2V at 136.36mA. The last time I tried to make a driver it didn’t work. Perfboard is not my friend.
In other news, I have decided to replace the x-axis linear actuator system with a much lighter belt-drive system. I will have pictures in the next post.