Author Archives: glenenglish

About glenenglish

electronics, bikes, mountains, propagation, RF systems, modems,

PnP : On stereo imaging and more focus

I had in my plans for two cameras in a stereo scopic setup for down vision so I could figure out depth and distance to things on the table . However. doh! , I was playing with my fancy PointGrey … Continue reading

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OpenPNp multithreaded directions..

added here  from my post in the forum.. I had a chat to Jason about this a week ago.. essentially… after component pickup, Open PNP motion thread tells motion-controller (external)  to go to the target location (PCB place) motion thread … Continue reading

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L6470 ST stepper driver

Wow, this baby is complex. Read this first…L6470 presentation I bought two eval kits from digikey/mouser $25 each. (mouser: 511-EVAL6470H-DISC ) It  has a USB interface, JTAG interface and some buttons. The eval software for the board is  comprehensive. There is alot … Continue reading

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Nozzle pitch

The main reason I went to NEMA14 for the  Z axis was the need to pack the nozzles in tighter. NEMA14 body is 35mm versus ’17 which is ~43. Ideally my nozzles will be the same pitch as the tape … Continue reading

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Stepper component rotation accuracy mitigation

More on this subject (see other post at component rotation…   Did a bit more playing. Got some Nema11s today, also (hollow) . These seem to be worse on  in accurate microsteps than the nema8s or 17s I have. But – … Continue reading

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Nozzle Z probing ideas

Using pressure sensitive resistor. At about 10% spring compression, resistor drops from 10M to about 50k,  and about 10k >50%. The nema8+adaptor (85g) sitting up top  compressed the nozzle spring about 85%

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PnP Z axis lift requirements- what size stepper

Z axis must be fast. ideally I want 50mS for 20mm travel. 12.5 mS to full velocity maybe use a big NEMA14 stepper with rotor inertia  18g/cm2 Total lift weight  – 16g (carriage) +20g( stepper mtging plate) + 120g (NEMA11 … Continue reading

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