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21
Radio Control Models / Re: State of the art 3D printed RC yachts
« Last post by Joules on August 17, 2018, 06:14:01 PM »
My design is more a keel boat pond yacht.  The actual model will be about 670mm long, but after reading the above website I decided to give spiral printing a go with the new 0.3mm nozzle.  That limited me to a 200mm test print, I was not disappointed.  The model design was started a couple of days ago as just a doodle idea, got more serious yesterday and prepared for 3D printing today.  The print took 6.5hrs at 0.1mm layers.  Once the print was done and the hull started cooling I had to puncture the deck before the shell imploded.  It was a little funky at the bow as the print spirals out and you need tons of cooling to stop it just being a melted blob.  With hind site, don't print a closed bow and do a plug for it.  The hull came in at 10grams, that is just crazy light, even compared to a 2 part styrene vac moulded hull.  The flat deck is a bit floppy, I should have designed it with some camber to make it more rigid, but not an issue as I need to open it up for ballast and test floating.  Rhino gives me some handy hydrodynamic analysis, this can be scaled up for the larger hull, to see how much weight I can have above the deck without it falling over in the water !!!   My cheap cnc craft cutter rounds out the equipment for model yacht making as it can cut multi panel sails in minutes and vinyl patches for hatch covers.  I can't ever remember building a hull in less than a month and this thing doesn't need paint.

With the deck cut out, the hull now weighs in at 7grams.
22
How to's / Re: Grinding the jaws on my three jaw chuck
« Last post by Pete. on August 17, 2018, 06:03:27 PM »
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How to's / Re: Grinding the jaws on my three jaw chuck
« Last post by awemawson on August 17, 2018, 05:47:16 PM »
Ade, how do all the Chinese eBay sellers manage to offer such low (or even included) postage on items? I can't remember where I heard it, but I did hear tell that the Chinese Government subsidise such transactions, but I don't know if that is apocryphal or not?
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Introductions / Re: Hi from Bolton UK.
« Last post by awemawson on August 17, 2018, 05:41:26 PM »
Ade, you KNOW you really want to do it yourself  :lol:
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Project Logs / Chester 626 riser block
« Last post by Markfd on August 17, 2018, 04:16:54 PM »
I want to fit a riser block to my new Chester 626 mill, which seems to be a popular improvement. I have downloaded drawings from the Yahoo! group & studied photographs, but have a couple of questions. Why is the block bored out which seems to be extra work? Why mill out slots for nuts when the block could be drilled for high tensile studs? Can I use a 4 riser without replacing the z axis screw providing I move the cap head stop on the column higher?
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Introductions / Re: Hi from Bolton UK.
« Last post by AdeV on August 17, 2018, 03:17:38 PM »
Hi John!  :wave:

I'm just down the road in Sunny Manchester at the moment - although I live on the Wirral (much sunnier...)

If you fancy a challenge.... I've got a Mazak Quickslant 20 which needs a good dose of refurbishing... I keep trying to persuade Andrew to leave his comfortable workshop behind & give me a hand, but he seems to be too busy every time I call him :scratch: :lol: So if you fancy a challenge.... just say the word :) There's :beer:  in it... (well, not actually in it, that'd be too easy!)
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How to's / Re: Grinding the jaws on my three jaw chuck
« Last post by AdeV on August 17, 2018, 03:06:02 PM »
Surely with your Chinese connections you can source a suitably sized chuck at a very modest price  :scratch:

The problem isn't sourcing the chuck - you're right, I could probably find a corner shop in Zhengzhou which sold them (I'm not joking either - you get the strangest shops out there... one of them sold compressors and electrical switchgear - and nothing else! :scratch: Literally 2 minutes walk from my wife's apartment is a small estate full of such shops, and it's all cheap as chips (compared to UK prices).  However, I didn't see any machine tool type shops, I suspect they're further out of town - or quite possibly in another town entirely.

The problem, as usual, is how to get a rather big lump of heavy metal back to the UK? Put it in a suitcase and it's bound to set off all kinds of alarms - and will probably use my entire luggage weight allowance, and I doubt I could sneak it through customs either! Which brings us to postage, which is where anything from China loses a big chunk of it's value-for-money, sadly.


PS: There's always the "leave your clothes behind..." approach  :lol: i.e. take a small suitcase with enough clothes to wear out there, then abandon them in favour of a chuck... unfortunately I can't easily buy clothes out there, I'm way bigger than most Chinese people, they just don't stock clothes in my size!
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How to's / Re: Grinding the jaws on my three jaw chuck
« Last post by AdeV on August 17, 2018, 03:00:59 PM »
I hate to be the voice of reason getting in the way of exotic bevel gear construction, but right spots mean you have chips in the he scroll.  Just open it and clean it out!

No, please! Continue to be the voice of reason - I'd never even considered that! Anyway, this is my "good" (slightly better, still pretty awful) chuck... I reckoned if I could rescue the really bad one then I'd be able to do the same to the better one continue using the rescued one forever amen!

Fortunately I've been working almost exclusively with aluminium recently, so with luck it's ali swarf rather than anything harder...
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Radio Control Models / State of the art 3D printed RC yachts
« Last post by Joules on August 17, 2018, 12:17:40 PM »
https://3dprintedradioyachts.com/why-3d-printing/

Very interesting and informative link.   I have done some shell printing over the years for micro gliders etc  Just started on my own design model yacht and the above turned up during a search.
30
CNC / Re: DDCSV1.1 4 Axis controller
« Last post by Benedikt on August 17, 2018, 11:06:31 AM »
WeldingRod:

One other question; copied the update files from Benedikt's website to the jump drive that came with the control.  I have since decided not to upgrade the firmware on the control and would like to remove the files to another location and return the jump drive to its original configuration.  There are two folders on the drive, install and upgrade and two files, splash.ppm and upgrade.do on the drive that I did not save to it.  Do you know if these four items were on the drive when it arrived?  Or were these four items downloaded from Benedikt's site?
You can safely delete splash.ppm, upgrade.do, install(.done) and upgrade. These have been added by the installer / extracted from the archive.

I have a similar issue as blades in that I want to set a parameter outside the limits of the controller.  In your post above, you instruct blades to use the configurator and then edit the values using Notepad++ on Mac / Linux before importing.  Can this be done on a windows machine?
Yes, Notepad++ is only available on Windows, so you can use Windows to edit the min/max values. On Linux/Mac you would use another programmer's editor of your choice (make sure to keep the line endings intact!).
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