Ideas for Increasing Arm Printability

Re: Ideas for Increasing Arm Printability

Postby Nicholas Seward » Wed Mar 19, 2014 5:50 pm

I suspect that this will be great! Do a test print and see how it goes.

Thanks,
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Re: Ideas for Increasing Arm Printability

Postby Niggle » Wed Mar 19, 2014 7:10 pm

Trying hard not to be stupid, this looks great for the slave arms but I'm not seeing how to handle the motor plus spool.

I'll go back and compare the designs now.
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Re: Ideas for Increasing Arm Printability

Postby imrahil » Wed Mar 19, 2014 7:23 pm

Yup, for genuine parts this trick works only for slave arm.
I tried some modifications on motor arm to prepare it for flat printing but with no luck so far.
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Re: Ideas for Increasing Arm Printability

Postby Niggle » Sat Mar 22, 2014 5:14 am

If I only had access to a working printer.

I was playing slice and dice with the motor arm in OpenSCAD this afternoon and realized that there is another significant difference between the motor and slave arms, in the presence, or not, of bearings.

My current goal is to move the bearings from the slave arms to the hub, and build the arms as two gear pieces joined by a spine piece and two plates that mount on either side the bearings. I'll add pictures in a day or three.
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Re: Ideas for Increasing Arm Printability

Postby imrahil » Sat Mar 22, 2014 5:11 pm

Printed! Full win! :)

IMG_20140322_114617_.jpg
Cold bed with PVA glue (wood glue) = perfect print!
IMG_20140322_114617_.jpg (235.34 KiB) Viewed 13993 times

IMG_20140322_174901_.jpg
IMG_20140322_174901_.jpg (236.49 KiB) Viewed 13993 times

IMG_20140322_174935_.jpg
IMG_20140322_174935_.jpg (247.4 KiB) Viewed 13993 times

If you ignore 1 or 2 missing layers on left gear all prints are almost perfect :)
(hot end clogged - changed print temp from 190 to 205 Celcius and problem disappeared)

Let the stringing begins! :mrgreen:
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Re: Ideas for Increasing Arm Printability

Postby tommythorn » Sat Mar 22, 2014 11:20 pm

I wonder if you could glue them and just use the screws for holding it together while gluing, removing them afterwards (very much like what Lotus Cars does). Your herringbone threads look much better than mine :)
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Re: Ideas for Increasing Arm Printability

Postby imrahil » Sat Mar 29, 2014 7:08 pm

During assembly I discovered major flaw of my multi-part, flat modification... Last screw on slave arm interferes with hub top!
IMG_20140329_194605_.jpg
There is no space for last screw!!
IMG_20140329_194605_.jpg (189.08 KiB) Viewed 13947 times


Quick fix with countersunk head socket screw:
IMG_20140329_195329_.jpg
IMG_20140329_195329_.jpg (174.24 KiB) Viewed 13947 times

IMG_20140329_195704_.jpg
IMG_20140329_195704_.jpg (174.2 KiB) Viewed 13947 times

Done!

ps. I'm still tinkering about multi-part motor arms :)
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Re: Ideas for Increasing Arm Printability

Postby Nicholas Seward » Sun Mar 30, 2014 1:47 am

Great work!
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