Limit Switches maybe....Home switches sure
Actually, I haven't yet decided if I will use these for limit switches but I'm for sure gonna use them for home switches based on the reported repeatablity in the original thread Electronic_Home_Switches_Made_Easy.html
I will probably set it up with two magnets for limits initially. We'll see.
I really want to thank RomanLini for the great thread and all the work he's putting into maintaining it.
BobL.
Need Help with 8020 T-Nut selection
Have been making progress, although there's not much visible difference.
I ordered some aluminum stock to make joining plates to secure the XYZ Gantry cross beams to my frame. I also ordered some roll in T-Nuts from Misumi for their 4080 extrusions.
These nuts will not roll into the 8020 extrusion (if that's what it is). I believe the cross beams are 8020 40 Series extrusions.
According to page 649 of the 8020inc Catalog I need nuts with a compatability code of 8-40. Acording to page 728 a roll in nut with an M8 thread would be part number 13094. So these are what I need, yes? It says they are for 30 Series extrusions, but I'm assuming there is cross over (Never ordered anything from 8020inc). Since they are a little pricey to just buy and hope (I did that already) I was hoping someone could verify this for me.
E-Bay Ad
(from the ad)
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METRIC 30 Series Zinc-Plated Steel Self Aligning M8 Thread Roll In T-Nuts, Part #13094.
These METRIC T-nuts are NEW INVENTORY from the factory, measure 16mm long x 11.6mm wide x 4.6mm thick, and load from the profile ends or sides. Each piece works best with the 30 Series profile and is compatible in our 8mm slot width profiles.
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Also, I've got some mini XLR female connectors to use for my home/limit switches. I'm working up the final design.
Have also ordered some male mini XLR connectors.
Have started working up a wiring diagram. I ordered some panel meters. Sorry, but I like the buttons/knobs/lights and crap.
Also finished installing the gearboxes. I could not get ALL the backlash out by sense of feel without what appears to me to be undue pinion/rack engagment force. It is not much and I'm guessing it's in the gearbox itself (?). I'm hoping the 10:1 ratio will make it imperceptable. If it is in the gearbox then some backlash compensation in Mach may be beneficial (?).
Anyhow, having fun but not much more to report at the moment, but do want to order some Nuts.
Thanks,
BobL.
9 Attachment(s)
Home Switches just about done :)
One of the things I've been working on are some home/limit(?) switches. I originally was going to cast the body to hold the parts but ran into some issues and ended up using HDMW.
It actually worked out pretty good. I milled the body shells out of 3/4" HDMW and was able to leave it as part of the body. Having access to both sides of the switch assembly made it easy to assemble. I checked that the LED lit when a magnet was present at each stage. Come to think of it I never tested the actual output. Sure hope they work, hmm.
Anyhow, they came out pretty neat I think. Doing this allowed me to incorporate the 90 degree oreientation between the arms so that I could use straight connectors (easier to obtain, and cheaper than the 90 degree connectors).
I used Mini-XLR 3 pin connectors with gold plated pins. Just filled each shell with epoxy. I'm sure that could be made with more care and look better but this will work :)
Still working on my wiring diagram.
Got some nuts that will fit into the extrusions supplied by XYZ Gantry.
Have the plates to attach the machine to the frame drilled. Just need to clean them up some then I can do the final adjustments to the frame and secure the machine to the frame.
Thanks for looking.
BobL.