Model Boat Mayhem
Technical, Techniques, Hints, and Tips => 3D CAD Design & Printing => Topic started by: colh107 on October 13, 2019, 11:07:47 am
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Designed to stock Mabuchi 540 spec sheet; 15 degree angle.
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What plastic / filament would you recommend?
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What plastic / filament would you recommend?
Oooooff! No idea, I'm afraid Martin - I have no experience with actually printing anything! (And I've only ever seen stuff printed by pro outfits). From my limited understanding, I guess filament size would affect accuracy (see below), and smoothness of surface - the latter not a problem on something like this.
The Windows 3D Print app links through to these guys (https://i.materialise.com/en) for ordering online. Their site has technical specs for their materials and processes, but I guess they have pretty good kit....
Their low end processes have accuracies down to 0.3mm, so I'll maybe reduce the hole sizes a bit to allow them to be drilled out more cleanly/accurately afterwards. (Debatable whether the hole centre they print is accurate, of course, but that's probably not too bad for this).
I don't know how 'home' printers compare.
Their price for that mount is about £11 ex VAT (though min order is £25), plus delivery. So not the cheapest, but not outrageous for a one-off bespoke fabrication, and probably who I'll use to begin with - don't have the time/energy to research buy/store/learn a printer of my own. And, tbh, probably not worth the money unless I'm doing a lot of stuff. (Mind you, I've designed 3 parts this weekend for various things %) )
Just to re-iterate - I know next to nothing about printing processes/technologies!! There'll be far more knowledgeable people than me in here.
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I've got a few mates that would print it for considerably cheaper than any of the online services. If interested drop me a message.
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Designed to stock Mabuchi 540 spec sheet; 15 degree angle.
Within reason I could alter the angle slightly, or other minor details, if anyone wants to try it out. I'd simply provide the STL file, 'no warranties expressed or implied' etc etc. [And bear in mind that, whilst I've triple-checked measurements, the design isn't yet proven in real life...]
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Normal PLA will be fine for this if you're using a FDM printer. No need for anything exotic.
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Why not just use a standard mount with a baseplate and mount it at an angle which is standard practice?
No need to complicate things surely?
Colin
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Why not just use a standard mount with a baseplate and mount it at an angle which is standard practice?
No need to complicate things surely?
Colin
Well.... it depends where you're trying to mount it, surely? Your suggestion wouldn't work on my old boat, nor on a Thimble, for example - due to the particular constraints of those designs. On either of those, a "standard mount" would put the shaft at least a cm too high. And might therefore give the coupling a bit of grief?
And anyway, I'm not trying to tell anyone this is 'gods gift'!! I worked up the CAD design for my own entertainment and my own needs. I just chuck it out there in public - for free - in case it might help anyone...!! <:( [At my real job I charge £80+/hr for design work....]
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Ah! But you could install the standard mount upside down by suspending it! Then it is easier to align the shaft. ok2
But I do agree that it depends on the actual circumstances.
Colin
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But I do agree that it depends on the actual circumstances.
Colin
Indeed ok2
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BTW I wouldn't use a pla printed part for a thimble, that may well distort. Definitely benefit from a metal mount, preferably with some water cooling for a fast electric.
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Are you actually using a 540 size brushed motor or a smaller and lighter brushless?
Pic below is as mounted in the SLEC 1/16 Swordsman kit.
Colin
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BTW I wouldn't use a pla printed part for a thimble, that may well distort. Definitely benefit from a metal mount, preferably with some water cooling for a fast electric.
Ah ok - that's worth knowing thanks.
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Are you actually using a 540 size brushed motor or a smaller and lighter brushless?
Pic below is as mounted in the SLEC 1/16 Swordsman kit.
Colin
Probably just a standard kinda brushed 540 (though haven't given it a great deal of detailed thought so far)
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Wouldn't even consider a brushed motor for fast electric these days. Brushless better by a country mile, and cheaper too. No maintenance, significantly lighter and easier to cool. A 28mm outrunner rated at around 2500-3000kv for a 2s set-up, or 1500-2000kv for 3s (higher voltage is easier on the batteries) will give very exciting performance on a thimble. Motor and speed controller can be had for under a tenner.
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It's just that looking at the plan profile you have posted any sort of 540 would seem to be putting a lot of weight well up up front. Subculture's suggestion will give you a much better performance at little cost. The smaller motor will be much easier to mount than the 40mm 540 can.
Colin
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It's just that looking at the plan profile you have posted any sort of 540 would seem to be putting a lot of weight well up up front. Subculture's suggestion will give you a much better performance at little cost. The smaller motor will be much easier to mount than the 40mm 540 can.
Colin
All useful tips and info, but going a bit off-topic for this thread - I'll probe your thoughts further in one of the other groups. Thanks.
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All useful tips and info, but going a bit off-topic for this thread - I'll probe your thoughts further in one of the other groups. Thanks.
Continued over here (https://www.modelboatmayhem.co.uk/forum/index.php/topic,23580.0.html)
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Are you actually using a 540 size brushed motor or a smaller and lighter brushless?
Pic below is as mounted in the SLEC 1/16 Swordsman kit.
Colin
Hi Colin. A 1/16 Swordsman is about 2 ft length I guess? What spec is that motor?
Cheers.
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The motor I have is the recommended Turnigy 2836/11. Not actually tried if afloat but it looks right for the job. Component Shop may be able to suggest an alternative if you can't get hold of one. I'm not an expert on brushless I'm afraid!
If you do get this motor be aware that the shaft is 4mm diameter.
Colin