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8ace
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PostSubject: Replacement Cartridges   Sat Dec 10, 2016 3:30 pm

Hi all,

I've been messing around in my workshop seeing if it is possible to make replacement modelgun cartridges. Making one or two is fairly simple but making large(ish) batches that are identical and interchangeable is a little more complicated.

But I think I've cracked it and here is my first batch of Hudson PPSH carts †Very Happy



I've tweaked the design from the original Hudson cart to strengthen the rim and nose (my one on the left). These are currently without internals (piston/primer) but they can be reused from damaged carts.



8ace
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ljerr2
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PostSubject: Re: Replacement Cartridges   Sat Dec 10, 2016 4:17 pm

cheers cheers cheers

Looks like a design improvement, too! Possibly feeding better with the smoother cartridge body and chamfered rim.
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smootik
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PostSubject: Re: Replacement Cartridges   Sun Dec 11, 2016 10:20 am

Looks so good this must be that newfangled 3D printing ;-)
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Cerwyn
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PostSubject: Re: Replacement Cartridges   Sun Dec 11, 2016 6:26 pm

I can vouch for these custom cartridges† Very Happy†I have 50 which are proving to be far stronger than the original Hudsons. Rims and cart noses are virtually unmarked after several times through my PPSh41
Very highly recommended ! † † † ††

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c_alexandersen
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PostSubject: Vouch   Mon Dec 12, 2016 6:12 am

Cerwyn wrote:
I can vouch for these custom cartridges† Very Happy†I have 50 which are proving to be far stronger than the original Hudsons. Rims and cart noses are virtually unmarked after several times through my PPSh41
Very highly recommended ! † † † ††

I have not tried 8ace' PPHS cartridges (yet) but i can certainly vouch for 8ace's work
nice good looking, i believe he has the the grip of making modelgun parts Very Happy
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mystikchepas
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PostSubject: Re: Replacement Cartridges   Mon Dec 12, 2016 9:02 am

How did you make it ?
I was planning to buy a 3D printer to try to make replacement cartridges for a Hudson AK-47 (not sure whether it will work).
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8ace
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PostSubject: Re: Replacement Cartridges   Mon Dec 12, 2016 6:34 pm

Hi,

Sadly carts can't be 3D printed due to the very fine thread joining the two halves. They have been made from brass on a lathe.

I'd recommend getting a 3D printer as I've just got one and have been having fun with it.

I have made some AK carts which are being tested before finalising the design. (4 new ones on the right)
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jay851
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PostSubject: Re: Replacement Cartridges   Mon Dec 12, 2016 9:05 pm

Great work 8ace. What sort of lathe you making them on, as i have a myford super 7 and hoping to start making some soon. Are you screw cutting the threads or using dies.
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c_alexandersen
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PostSubject: how did you do ?   Tue Dec 13, 2016 5:11 am

mystikchepas wrote:
How did you make it ?
I was planning to buy a 3D printer to try to make replacement cartridges for a Hudson AK-47 (not sure whether it will work).


8ace is correct on the threading - the 3D printer will not be able to do that
next i am quite sure that the 3D printing base material will be too week to carry the forces in the rim, thus bog risc of breaking durring chambering or extraction.

i have not worked professionally with 3D printing in years now but do also see manufacturing tolerances as a challence for the 3D printing process

Go for the Lathe Shocked
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mystikchepas
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PostSubject: Re: Replacement Cartridges   Tue Dec 13, 2016 8:05 am

That's really nice 8ace Smile
If your cartridges are working I will for sure buy some of them !!!
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Cerwyn
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PostSubject: Re: Replacement Cartridges   Tue Dec 13, 2016 9:59 am

I tested 5 of 8ace's AK cartridges and found them to be excellent. My HUDSON AK was heavily modified several years ago to make it perform properly. It's capable of firing 30 cartridges without stoppages.
8ace's aluminium Carts are tough. Very little rim marking from the Extractor & Ejector, smooth feeding and extraction.†
When more are available to buy I'll be buying some for certain Very Happy

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mystikchepas
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PostSubject: Re: Replacement Cartridges   Tue Dec 13, 2016 10:29 am

Ok you have at least 2 buyers cheers
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mystikchepas
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PostSubject: Re: Replacement Cartridges   Thu Jan 05, 2017 11:16 am

I'm just curious : how long does it take to make one cartridge ?
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8ace
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PostSubject: Re: Replacement Cartridges   Thu Jan 05, 2017 12:52 pm

Once setup it usually takes about 2-4 minutes to make each component so a complete cart would be around 10-14 minutes.

8ace
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mystikchepas
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PostSubject: Re: Replacement Cartridges   Thu Jan 05, 2017 1:10 pm

Great !
I thought it would take a lot of time !
Well when your AK-47's carts will be ready I buy them Smile
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8ace
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PostSubject: Re: Replacement Cartridges   Thu Jan 05, 2017 1:45 pm

With the CNC lathe setup the machining part is reasonably quick as there are no manual tool changes; if it took anymore time Iím not sure Iíd be making them as the time needed to produce them would be prohibitive.

Iíll give you a shout when I start making them which could be in a month or so as Iím finalising the piston design.


8ace
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mystikchepas
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PostSubject: Re: Replacement Cartridges   Thu Jan 05, 2017 3:26 pm

Ok thanks ! cheers
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mystikchepas
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PostSubject: Re: Replacement Cartridges   Fri Mar 03, 2017 9:32 pm

Can't wait Very Happy
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mystikchepas
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PostSubject: Re: Replacement Cartridges   Fri Jun 30, 2017 6:46 pm

I received my replacement carts today Smile
It is a really nice job.
Thanks a lot 8ace cheers
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