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Printrbot Talk Forum • View topic - Modeling 3/8-16 ACME thread

Modeling 3/8-16 ACME thread

Discussions about CAD use and designing

Modeling 3/8-16 ACME thread

Postby Defy » 2014-Jul-Wed-20-Jul

Anyone know a good way to model 3/8-16 ACME thread? I currently only use OpenSCAD but I hear it's not good for threads and such. What do you guys think?

Looking to build this flange to test out before I spend 30 bucks a piece on brass ones.

Or if anyone wants to make an stl of a 25mm long threaded rod so I can difference it from my drawing of this that would be great!!!
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Modeling 3/8-16 ACME thread

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Re: Modeling 3/8-16 ACME thread

Postby marmil » 2014-Jul-Wed-21-Jul

If you have Sketchup installed you might check to see what's available in the vast community library. Export as stl to bring into OpenSCAD.
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Re: Modeling 3/8-16 ACME thread

Postby Defy » 2014-Jul-Wed-22-Jul

Thanks, never messed with sketchup I'll have to look. I have been holding out till I can get a good deal on solidworks so I really only have played with OpenSCAD and it's been fine so far this is the first project I haven't been able to do in OpenSCAD.
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Re: Modeling 3/8-16 ACME thread

Postby thawkins » 2014-Jul-Wed-23-Jul

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Re: Modeling 3/8-16 ACME thread

Postby Defy » 2014-Jul-Wed-23-Jul

I saw that but the Acme threads are different.
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Re: Modeling 3/8-16 ACME thread

Postby evanalmighty » 2014-Jul-Thu-01-Jul

Have you checked to see if McMaster Carr has that flange in solidworks format? They have 3D cad files for most of their products. If you can't find it let me know and I'll see if I can draw one up with Solidworks this weekend.
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Re: Modeling 3/8-16 ACME thread

Postby Mooselake » 2014-Jul-Thu-08-Jul

There's several openSCAD thread libraries. Google is your friend.

At least one talks about multi-start so ACME and/or trapezoidal should be included.

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Re: Modeling 3/8-16 ACME thread

Postby Mooselake » 2014-Jul-Thu-11-Jul

I stumbled across a that includes acmes.

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Re: Modeling 3/8-16 ACME thread

Postby spitfirehauser » 2014-Jul-Thu-13-Jul

what you are trying to model looks like this thingiverse object i use the 50mm and it works great at giving me extra Z height without backlash
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Re: Modeling 3/8-16 ACME thread

Postby Defy » 2014-Jul-Thu-19-Jul

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Re: Modeling 3/8-16 ACME thread

Postby Defy » 2014-Jul-Thu-20-Jul

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Re: Modeling 3/8-16 ACME thread

Postby EddB » 2014-Jul-Fri-13-Jul

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Re: Modeling 3/8-16 ACME thread

Postby Defy » 2014-Jul-Fri-17-Jul

I bought that set for 20 but the set I got is 3/8 -12. I bought the 3/8-16 because I figure more threads per inch more precision, but as i read more and more it's not nessary. Either way I got 3 3' sections of 3/8-16 so I am using it!
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Re: Modeling 3/8-16 ACME thread

Postby Mooselake » 2014-Jul-Fri-18-Jul

At 16x microstepping the precision is way, way more than you could ever use. For example, 16 (microsteps/step) x 200 (steps/rev) * 12 (rev/inch) is 38,400 steps per inch (1512/mm). That works out to 26 millionths of an inch per step (or 660 millionths of a mm). Way beyond practicality or possible printing, when you're lucky to get .05mm layers. Besides you'd grow older than me waiting for a .001mm layer print to finish. For a Z axis it makes more sense to go the other way, and decrease the microstepping ratio.

Plus it's not really that precise. The tolerances on the screw are way less than that.

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Re: Modeling 3/8-16 ACME thread

Postby Defy » 2014-Jul-Fri-19-Jul

Yeah i found that out after i bought them. I will have to figure out what numbers to put into the firmware too.
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Re: Modeling 3/8-16 ACME thread

Postby Mooselake » 2014-Jul-Sat-12-Jul

it's 16 threads per inch, 16x microstepping, and 200 steps/revolution motors. So one inch is 16 revolutions, one revolution is 16x200, or 3200 steps. That gives you 51,200 steps per inch of Z travel. Since the 3D printer world has adopted the french system of measurement, and there's 25.4 of those guys per inch, it gives you 2015.75 steps per mm, to more decimal places than you need. Assuming my hoof hit the right calculator keys, of course, so double check it.

While it's popular to print and measure for calibration, the calculated values are much more accurate.

Good Luck! I'd like to see how this works out for you, and what difference it makes.

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Re: Modeling 3/8-16 ACME thread

Postby Defy » 2014-Jul-Sat-13-Jul

Sweet thanks i am not there yet. Still trying to get some alu cut for my x axis, and expanding one of my printers to be able to print 9 inches. I have the bed for it but it only prints 8 because of the bearings.
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