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I have 2 of the robotdigg adapters. I know one of them is darn near perfect, the other has some wobble. I will try and measure tomorrow just how much.A lot of the wobble comes down to how you seat and tighten the nozzle into the adapter. There is a rubber gasket that can be compressed funny and cause it to seat a bit off.I think it is wise to map the runout and offset for it where possible to give the optimal results.
Sent from my iPhone
Graeme,I believe the Robotdigg adapter that many people are using (and that I am waiting to receive) is a press fit on the motor side and a set screw on the nozzle side. People are reporting runout with these, but I am not sure at what point. One video I saw recently showed someone testing with an indicator but it was against the plastic ring which I think is a mistake. I'd suggest testing against the nozzle itself.In any case, when I get mine I'll do said test and see what I come up with. Currently I am just using some cheap 5mm to 7mm shaft couplers off eBay and they are just too loose to be useful.Jason
On Sat, Feb 27, 2016 at 12:13 AM 'Graeme Bridge' via OpenPnP <ope...@googlegroups.com> wrote:
Jason,I have been looking at this adaptor and thinking that if one was made with a slightly smaller diameter than the shaft it could be heated and pressed onto the motor shaft. This would eliminate any need for seals or set screws which would create runout,. Alternatively a nice tight tolerance and hold it on the shaft with loctite bearing retainer--
On Saturday, February 27, 2016 at 6:32:57 AM UTC, mob...@gmail.com wrote:Serious pick and Place have good nozzle shaft with no runout and are made similar to drill spindles on Mill.
Then exists two other category. First have mechanical centering, second have optical feedback. Example is Cyberoptics laser centering. Lowest cost feedback is up looking video. Take snapshot , rotate, second snapshot and its possible to know runout.
If for example you check four quadrants and then do interpolation this should be enough and checking it is needed only once, so basically either you do it in hw, sw or combination.
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Here are the results from both of my nozzles at the very tip.RUNOUT at the tip:Nozzle 1: .150mmNozzle 2: .038mm
On Saturday, February 27, 2016 at 2:15:58 AM UTC-7, Anthony Webb wrote:
I have 2 of the robotdigg adapters. I know one of them is darn near perfect, the other has some wobble. I will try and measure tomorrow just how much.A lot of the wobble comes down to how you seat and tighten the nozzle into the adapter. There is a rubber gasket that can be compressed funny and cause it to seat a bit off.I think it is wise to map the runout and offset for it where possible to give the optimal results.
Sent from my iPhone
Graeme,I believe the Robotdigg adapter that many people are using (and that I am waiting to receive) is a press fit on the motor side and a set screw on the nozzle side. People are reporting runout with these, but I am not sure at what point. One video I saw recently showed someone testing with an indicator but it was against the plastic ring which I think is a mistake. I'd suggest testing against the nozzle itself.In any case, when I get mine I'll do said test and see what I come up with. Currently I am just using some cheap 5mm to 7mm shaft couplers off eBay and they are just too loose to be useful.Jason
On Sat, Feb 27, 2016 at 12:13 AM 'Graeme Bridge' via OpenPnP <ope...@googlegroups.com> wrote:
Jason,I have been looking at this adaptor and thinking that if one was made with a slightly smaller diameter than the shaft it could be heated and pressed onto the motor shaft. This would eliminate any need for seals or set screws which would create runout,. Alternatively a nice tight tolerance and hold it on the shaft with loctite bearing retainer--
On Saturday, February 27, 2016 at 6:32:57 AM UTC, mob...@gmail.com wrote:Serious pick and Place have good nozzle shaft with no runout and are made similar to drill spindles on Mill.
Then exists two other category. First have mechanical centering, second have optical feedback. Example is Cyberoptics laser centering. Lowest cost feedback is up looking video. Take snapshot , rotate, second snapshot and its possible to know runout.
If for example you check four quadrants and then do interpolation this should be enough and checking it is needed only once, so basically either you do it in hw, sw or combination.
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Auto tool changing is too awsome feature to forget about it :)
But ring magnets of appropriate size are hard to find. So I was thinking about something like this:
I dont know the 2000 juky nozzle but the older series have all oring inside nozzle holder approx 5.5mm .
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Hey Cri S,
I'm talking about JUKI 500 series nozzle and holder. Still given information from you is essential, I think P7 O-ring is required inside the holder. Thanks! :)
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Mick
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Wouldnt it work to add a flexture (like 3 vertical slots) to accomodate a variety of shaft precisions?
Peter
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lol my bad JasonI will finish up the drawing if we want to change anything we can. I will also drop into my machine shop next week and get a quote as I'm going to see him anyways about some other parts.What material are we thinking?Ray's part is Steel with a chemi black coating by the looks of it. I know chemo black is expensive over here as i have my bolts done with that and you need to do a lot to get it cheap.If its just a corrosion protection i would go with a zinc pas which will give a yellow/gold appearance
Graeme
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