LitePlacer.com forums

Is there a reason? Countersinking increases cost, and glueing might be unreliable. Tapping also increases cost and you might run into problems with screw length: Let's say the top plate is 2mm, bottom plate is 3mm. Then you would need an M3x4.5mm thumb screw to fix the top plate. There is no such t...

Hey John, looks great - I like it. May I suggest once more to insert the screw from the bottom and use a thumb nut instead? See this part: http://uk.misumi-ec.com/vona2/detail/221005014274/?HissuCode=ROLLNN-M3-NI A 2mm bottom plate would allow counter-sinking an M3 screw on bottom side of rail - wou...

Now that I just wrote that, I thought of something else:

Instead of screwing thumb screws into tapped holes in the bottom plate, you could insert the screws from the bottom (countersunk from bottom) and use a thumb nut to fix the sliding top rail.

I am no mechanical engineer either, but I know there are norms for screws and nuts. For example ISO 4032 "Metric Hex Nuts Dimensions" :-) A standard M3 hex nut is 2.4mm thick; gives you a ballpark figure. So 2.5mm should be good, 2mm might still work as we probably apply a lot less force t...

Sorry, my bad. I misunderstood this: How about: Put the indexing on the bottom plate. I thought of indexing = fiducials, while Juha meant the grid to align the feeders... But what I wrote with regards to fiducials still applies. These should be on top of the feeder and the pin "poking through&q...

I have no objections to 22mm total height either - I will need to change my machine anyways to support more Z-clearance and higher pickup / placement level. I disagree to putting fiducials (only) on the rails for the following reasons: - They will be at a much lower Z-level, so they might be out of ...

Hi John, the latest design is looking really good - two thumbs up :D Just for clarification - can the clip at the back (right) slide a bit back and forth to accomodate for sprocket hole spacing tolerances in tape (see picture)? feeder_slide.png The QR code and / or fiducial holders could be a 3D pri...

The "alternative" version of LitePlacer (rmod aka. Knaster's modifications) supports all sorts of fiducials by applying pattern matching. Basically you take a picture of the fiducial, save that as a pattern and software can find it later using vision. I am unsure if Juha's main branch supp...

Your question gives the answer to the jumping. When I used the holders without suitable support below the pockets the tape was not fixed very well at its edges. Therefore the downward probing pressure led to a bending kind of deformation that snapped back when the head move back up. Don't get hung ...

But using the probing function is very nice and comfortable. Agreed, but it also causes issues. The force required to trip the probing switch was about 3.6N on my machine. That is enough force to dent electrolytic caps or crush embossed tapes in strip holders. I have experimented with alternative s...