Replication Rate Estimate?

Hey all.

I'm doing up my slides for Penguicon, (and, as is traditional for
presentations, I'm trawling through all the other photographs, slides,
videos, etc, that we have.)

I was wondering, what's our current estimate for the RepRap replication rate?
(The time for one unit to print all the plastic parts for the next unit.)

Also, what's the total volume/weight of the plastic parts in Darwin?

I know we're aiming for a deposition rate of ~10 cc/hour, but I'm having
trouble guesstimating how much plastic we'll be using.

This information should be in prominent places online, in my email folders,
and in my brain, but I can't seem to find it.

Cheers,
Sebastien
_______________________________________________
Developers mailing list
Developers@reprap.org
[reprap.org]

> Also, what's the total volume/weight of the plastic parts in Darwin?

I've yet to add all the data up, but my gut feeling is 1200 cc of build
material. Support material ~5% of that.

eD


--On 20 April 2007 00:00 -0400 Sebastien Bailard
wrote:

> Hey all.
>
> I'm doing up my slides for Penguicon, (and, as is traditional for
> presentations, I'm trawling through all the other photographs, slides,
> videos, etc, that we have.)
>
> I was wondering, what's our current estimate for the RepRap replication
> rate? (The time for one unit to print all the plastic parts for the
> next unit.)
>
> Also, what's the total volume/weight of the plastic parts in Darwin?
>
> I know we're aiming for a deposition rate of ~10 cc/hour, but I'm having
> trouble guesstimating how much plastic we'll be using.
>
> This information should be in prominent places online, in my email
> folders, and in my brain, but I can't seem to find it.
>
> Cheers,
> Sebastien
> _______________________________________________
> Developers mailing list
> Developers@reprap.org
> [reprap.org]




_______________________________________________
Developers mailing list
Developers@reprap.org
[reprap.org]

Sebastien Bailard wrote:

> I'm doing up my slides for Penguicon, (and, as is traditional for
> presentations, I'm trawling through all the other photographs, slides,
> videos, etc, that we have.)
>
> I was wondering, what's our current estimate for the RepRap replication rate?
> (The time for one unit to print all the plastic parts for the next unit.)
>
> Also, what's the total volume/weight of the plastic parts in Darwin?
>
> I know we're aiming for a deposition rate of ~10 cc/hour, but I'm having
> trouble guesstimating how much plastic we'll be using.
>
> This information should be in prominent places online, in my email folders,
> and in my brain, but I can't seem to find it.

It's pure guesswork, which is why we haven't pushed the figure; we don't
want people to say "you're going only 80% the speed you said you would".

Darwin polymer parts: about 1 kg.

Time to replicate for V 1.0: guess maybe a week?

--

Best wishes

Adrian

Dr Adrian Bowyer
[staff.bath.ac.uk]
[reprap.org]
_______________________________________________
Developers mailing list
Developers@reprap.org
[reprap.org]

Here's the way I calculate it.

Deposition Rate = Max traverse rate (mm/sec) x extrusion cross-sectional area (0.5 mm^2 for HDPE out of a 0.5 mm orifice) x 60 x 60 x 0.75 (a number Adrian talked about that accounts for time spent moving the extruder head when it isn't extruding)/(1000 mm^2/cc)

I assume that Darwin will be using diagonal cross-hatching infill, so the max traverse rate should be the (max single axis traverse rate) x 2^0.5.

IIRC, CAPA gets an extrusion cross section area of about 0.75-0.80 mm diameter whereas HDPE is pretty solidly 0.8.

Backing into the max traverse rate for a single axis assuming 10 cc/hr, I get a single axis traverse rate of about 5.25 mm/sec.

Is that right? I thought Darwin was supposed to be LOTS faster than that given that it was using belts instead of threaded rods and all. I've been able to get my takeoff on the Mk II extruder to extrude at 12-15 mm/sec.






----- Original Message ----

From: Adrian Bowyer

Cc: developers@reprap.org

Sent: Monday, April 23, 2007 9:34:17 AM

Subject: Re: Replication Rate Estimate?



Sebastien Bailard wrote:



> I'm doing up my slides for Penguicon, (and, as is traditional for

> presentations, I'm trawling through all the other photographs, slides,

> videos, etc, that we have.)

>

> I was wondering, what's our current estimate for the RepRap replication rate?

> (The time for one unit to print all the plastic parts for the next unit.)

>

> Also, what's the total volume/weight of the plastic parts in Darwin?

>

> I know we're aiming for a deposition rate of ~10 cc/hour, but I'm having

> trouble guesstimating how much plastic we'll be using.

>

> This information should be in prominent places online, in my email folders,

> and in my brain, but I can't seem to find it.



It's pure guesswork, which is why we haven't pushed the figure; we don't

want people to say "you're going only 80% the speed you said you would".



Darwin polymer parts: about 1 kg.



Time to replicate for V 1.0: guess maybe a week?



--



Best wishes



Adrian



Dr Adrian Bowyer

[staff.bath.ac.uk]

[reprap.org]

_______________________________________________

Developers mailing list

Developers@reprap.org

[reprap.org]












__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
[mail.yahoo.com]
_______________________________________________
Developers mailing list
Developers@reprap.org
[reprap.org]