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From: Bob La Londe <none@none.com99>
Newsgroups: rec.crafts.metalworking
Subject: Re: How long would it take you to 3D print this ABS plastic part?
Date: Wed, 24 Jul 2024 14:28:38 -0700
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On 7/24/2024 2:19 PM, Bob La Londe wrote:
> https://www.yumabassman.com/wp-content/uploads/2024/07/Part-1.jpg
> 
> https://www.yumabassman.com/wp-content/uploads/2024/07/20240724_135900.jpg
> 
> 
> https://www.yumabassman.com/wp-content/uploads/2024/07/20240724_134300.jpg
> 
> 
> The first one took 2 days.  The second one took 10 minutes.  The third 
> one too 45 seconds, okay maybe 60 including cleanup.
> 
> This mold was not actually designed for ABS injection.  I had to use a 
> cheater bar on my injection press to get them to fill, then I had to add 
> extra clamping to keep them from flashing.  This mold was designed for 
> gravity a much much lower viscosity fluid.  The blue streaks are left 
> over polypropylene, ABS takes higher injection pressure and like I said 
> I had to use a cheater bar to get enough pressure to fill with my hobby 
> level injection press.   The tapered pins pop right out with a light tap 
> from my brass hammer.
> 
> If I had designed it for plastic injection it would have 10-15 clamping 
> screws in the mold instead of the one to hold it close for gravity 
> casting.  Probably 15.  It's better to have them and not need them than 
> to need them and not have them.  If I was serious about it I'd probably 
> hold the mold closed with either a pneumatic or a hydraulic vise.
> 
> This is actually a reject mold.  I decided to do it differently to make 
> it easier for the end user.  It's still just intended for gravity casting.
> 
> 

If I am honest with myself after the injection press is up to 
temperature, and the mold is preheated it's probably about 2-3 minutes 
per part net to hand inject these.

-- 
Bob La Londe
CNC Molds N Stuff


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