Rapid Prototyping

[Gone AwayParticipant @goneaway]

Posted by Bazyle on 07/08/2013 22:06:48:

That reminds me of what was being said about home computers I was making in the seventies.

I remember that time too. Every one used to say "but what can you do with it".

One of the first really useful programs that came along in the old CP/M days ( before MSDOS) was a program that worked out mortgage payments. It let you do a lot of "what if" scenarios and it opened up the world to me as to what really happens. I'd just taken out the mortgage on my house and that program was instrumental in allowing me to pay it off in 6 years.

[Ian PParticipant @ianp]

Posted by Sid Herbage on 07/08/2013 21:33:03:

You followed a quote character with a parenthesis and stoopid editor thought it was a smiley. Like this "

Try adding a space before the parenthesis …. like this " )

Edited By Sid Herbage on 07/08/2013 21:35:11

Sid

I see what you mean.

I doubt I shall change the way I type just for this editor, one of my pet hates is spaces after and before pathenthesis.

Ian P

[John Stevenson 1Participant @johnstevenson1]

" ( Why ? " )

[Ian PParticipant @ianp]

Because it look naff, and anyway is not the correct usage, (Google it)

Ian P

[Anonymous]

Errr, isn't it correct usage to end a sentence with a full stop, question mark or exclamation mark?

Andrew

[John Stevenson 1Participant @johnstevenson1]

" ( Why ? " ) .

[Ian PParticipant @ianp]

This is not at all like you John, your usual posts are informative, verbose, a model of clarity, and frequently entertaining. What's happened?

Ian P

[jason udallParticipant @jasonudall57142]

“( Why? “) posts John…
++++ SYNTAX ERROR MISMATCHED PARENTHESES ++++
..

[Tony JeffreeParticipant @tonyjeffree56510]

Posted by jason udall on 08/08/2013 11:34:32:
"( Why? &quot posts John…
++++ SYNTAX ERROR MISMATCHED PARENTHESES ++++
..

His parents were obviously well matched or he wouldn't be here. And what are "heses" anyway?

Regards,

Tony

[Trevor WrightParticipant @trevorwright62541]

Sorry to be boring but will answer Ian's question about the cable reel…..

On works computer now and everything functions….

There is a learning curve so making something you can use like the reel holder was a good place to start, the reel was made of smaller bits as the printing area is limited to 140mm x 140mm.

You have a very valid point in that things are being printed because they cannot find anything better to do. But it will not always be like that. The quality will not match injection moulding but if you only want one you will not spend thousands making a mould….

Prints have to have a flat base and thin out as it prints vertically, so a lot of my designs are made of 2 parts where the flat faces butt together, the hexagonal pockets…well why not?

Trevor

Edited By Trevor Wright on 08/08/2013 12:41:59

Edited By Trevor Wright on 08/08/2013 12:52:16

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Michael Gilligan on 07/08/2013 15:26:09:

Thanks for the info. Trevor

Like Russell, I would be very interested to see some photos of what it can produce.

I just had a look at the spec. quoted here, and I'm rather confused regarding speeds.

You say "my Huxley has a feed-rate of 12m/min, and it needs it." … but the spec. shows a maximum "Building Speed" of 1,800mm/min, so I presume that the 12,000mm/min is a "Fast Traverse" speed.

Grateful if you can clarify this.

MichaelG.

.

Trevor,

In the hope of getting this thread back on topic …

I would be grateful for some clarification regarding Huxley's speed.

Many thanks

MichaelG.

.

Edit: I see it's already back on topic  

 

Edited By Michael Gilligan on 08/08/2013 12:42:02

[Trevor WrightParticipant @trevorwright62541]

Michael,

The speed settings are set on 12000mm/min but it prints much slower, the piece in the earlier photo would take about 30 minutes to print, but there is also time taken to heat the bed and nozzles to temperature before you start, around 3-4minutes. At the end of the print the bed has to cool to around 35°C or the print distorts as it is still soft, and then it has to be heated again for the next print…

Rapid movements are roughly 5000mm/min and printing at 300-500mm/min but with oscillating strokes at 45° to the profile. A cnc machine tool will have too much inertia to cope with the stop/start motion and burn motors out. A CNC router may be able to cope but the moving parts need to be very light.

Trevor

[Michael GilliganParticipant @michaelgilligan61133]

Trevor,

Excellent, thank you.

MichaelG.

[John Stevenson 1Participant @johnstevenson1]

As a guide my litle Isel router rapids at 7,000 mm / min but with only 300 mm to move in it never achieves that speed and can cut at 5,000mm / min, again acceration plays a big part in all this.

Many regard speed as the be all and end all but I find it's more dick slapping because if you watch the spped on the screen it's far less than quoted speeds.

[BazyleParticipant @bazyle]

One of the industrial uses is to make a prototype to see how the injection moulded or CNC item will turn out. While it may not be practical for quality models it might be suitable for utility mechanisms and electrical supports (in a suitable plastic). I like the idea of hexagonal holes as my hexagonal drill only does large ones.

An interesting case might be the main block for the Meek screwcutting clutch. Would a printed item be strong enough?

edited to add : can metal parts be embeded to add strength – I would think so but cooling affects might mess up the printing. How about lumps of plastic or wood?

Edited By Bazyle on 08/08/2013 13:41:29

[John Stevenson 1Participant @johnstevenson1]

Yes metal parts can be added but the design has to accept them

What I mean by that is you can't drop a nut on then go round it as the head will foul the nut, but a nut could be dropped into a pocket , then part covered over if from top access

Sent from my iPram

[Michael GilliganParticipant @michaelgilligan61133]

Regarding

1. Print Quality, and
2. Relevance to Model Engineering

This looks encouraging.

MichaelG.

[Sub MandrelParticipant @submandrel]

Of course the great thing about rapid prototyping is that you can print out lot's of little apostrophe's and put them in all sort's of place's.

Neil

[John Stevenson 1Participant @johnstevenson1]

Posted by Michael Gilligan on 09/08/2013 20:17:57:

Regarding

1. Print Quality, and
2. Relevance to Model Engineering

This looks encouraging.

MichaelG.

Michael,

Thats the model printer I saw in use. Night and day compared to the reprap machines as regards quality.

Talking to the guy on the phone today and he's been looking under the covers on the machine and the axis run on proper minature NSK type rectangular linear bearings and not plain rod and plastic bushes like the reprap.

Old adage "You only get what you pay for "

[Michael GilliganParticipant @michaelgilligan61133]

John,

Thanks for confirming that.

It's also interesting to see that they have launched a lower price "mini" version

… Hope the build quality isn't slipping just to get the price down.

Specs and Manuals are on the UP website.

Having seen what can be done, I am greatly encouraged to build something around a microscope chassis … plenty of good ball-slides in the better ones.

MichaelG.

 

Edit: Website linked above is the US distributor

Here is the parent.

Edited By Michael Gilligan on 09/08/2013 23:39:59

[John Stevenson 1Participant @johnstevenson1]

That was the Mini I saw in action.

That is also the same machine that Art Fenerty of Mach3 fame has for printing his gears out to check the maths in Gearotic.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by John Stevenson on 09/08/2013 23:55:46:

That was the Mini I saw in action.

That is also the same machine that Art Fenerty of Mach3 fame has for printing his gears out to check the maths in Gearotic.

.

John,

Thanks for reminding me … That makes it even more encouraging !!

I should have checked back to your earlier post.

< 31/07/2013 23:34:48 >

With those at $999 [ready-built ], there are definitely interesting times ahead.

MichaelG.

.

Edit:  Also features in the Denford Catalogue

Edited By Michael Gilligan on 10/08/2013 08:42:03

Edit: Just found them at a very good UK price !!

Edited By Michael Gilligan on 10/08/2013 08:57:41

[Russell EberhardtParticipant @russelleberhardt48058]

Posted by John Stevenson on 09/08/2013 22:46:29:

Talking to the guy on the phone today and he's been looking under the covers on the machine and the axis run on proper minature NSK type rectangular linear bearings and not plain rod and plastic bushes like the reprap.

I think the later versions of RepRap use linear ball races rather than plastic bushes. I guess the motion accuracy could be improved by replacing some of the plastic parts with metal for rigidity. I would think the most critical part for surface finish would be the extruder.

Russell.

[Michael GilliganParticipant @michaelgilligan61133]

I was under the impression that Denford only supplied to the Education Sector; but their buy-online links to the isupply3d site … which, interestingly, also sells Spares for the UP! printers.

MichaelG.

[Sub MandrelParticipant @submandrel]

I used to have some very high quality drawer runners based around linear ball races. they were very solid (more robust than a 3-d printer would need) with no shake but little friction. Alas I think they got recycled

Neil

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