6-7 figures is prohibitive for all but the most well off amature. Even when
I was making 6 figures/yr for 20 years I couldn't afford nor justify that
kind of expenditure.
But a printing service would be a horse of a different color like the one
just posted by Joe. Needs further investigation.
K.
On Thu, Aug 13, 2020 at 11:00 AM Tyler Adkison <tyler.adkison@xxxxxxxxx>
wrote:
Most don't even use a 1KW fiber laser. Sure, some like the EOS M400 do,
but I would say the majority tend to use lasers in the 250watt range. The
cheapest systems (usually some sort of major limitation) start at about
$100,000. I'd say the more common price range is the $350,000 to
$1,000,000.
On Thu, Aug 13, 2020 at 10:39 AM roxanna Mason <rocketmaster.ken@xxxxxxxxx>
wrote:
The caveat though is cost. This is an amature site so by nature has cost
limitations. What is the cost of a laser sintering printer anyway? I know
how much my 1KW fiber laser cost, mid 5 digits. And that's one kilowatt,
how about 5 or 10KW's?
K
On Thu, Aug 13, 2020 at 8:02 AM David Gregory <david.c.gregory@xxxxxxxxx>
wrote:
Nearly every rocket engine developed in the last five years incorporates
SLM parts on it, including several built by people on this list.
On Wed, Aug 12, 2020 at 3:35 PM roxanna Mason <
rocketmaster.ken@xxxxxxxxx> wrote:
Technology advancement is great, I hear that the Rutherford engine for
the Electron launch vehicle is 3D printed.
If you need a 1KW fiber laser for your printer I have a brand new one
still under warranty.
Thanks Carl,
K
On Wed, Aug 12, 2020 at 12:51 PM Carl Tedesco <ctedesco@xxxxxxxxxxxxxx>
wrote:
Ken, when I designed the printable LR-101 injector, the state of the
art DLS printer were all EOS and they did not have the build volume to do
an LR-101. I designed several “mini-LR-101’s”, but never was able to have
them printed since at that time the cost was always prohibitive. In 3D
printing, the bigger the z-axis, the longer the run time = $$$.
Since then the SDSU students I advise have made 3D printed motors in
parts (as Henry S. has suggested), so the tall z-axis problem goes away.
There is a seal involved, but it wasn’t a show stopper. I also did a 100
lbf. LOX/LCH4 100 lbf printed motor (attached pic), but it was small, ~8”
tall. That was about $2500. The injector was 3D printed too, but it is
proprietary, so I cannot show it.
--- Carl
*From:* arocket-bounce@xxxxxxxxxxxxx <arocket-bounce@xxxxxxxxxxxxx> *On
Behalf Of *ken mason
*Sent:* Wednesday, August 12, 2020 10:48 AM
*To:* arocket@xxxxxxxxxxxxx
*Subject:* [AR] Re: LR-101 injector
Interesting Carl, have you looked into a printed TCA too? Since I
first heard about SLS,Selective Laser Sintering, the LR-101
immediately came to mind. Though the injector wasn't part of that since
it's a 'straightforward' lathe/mill job all made of simple aluminum.
The bottom line, is there a demand/market for a 'cheap' LR-101 beyond
limited amature use?
Nice work,
Thanks,
Ken
On Wed, Aug 12, 2020 at 10:31 AM Carl Tedesco <ctedesco@xxxxxxxxxxxxxx>
wrote:
Barry,
Those images are of reproduction LR-101 injectors I had made. I
contracted out the machining to a friend of mine, but I made the FOD
screen
myself. Some tips my machinist used on these injectors:
1. Leave 0.040”-0.60: of extra material on the injector face, that
way you can add a small countersink for the angled orifices to avoid
drill
“wandering”. After all orifices are drilled you can machine away the
extra
material. This will also minimize burrs.
2. Sharp drill bits are a must, so replace them often. They are
small drill bits and inexpensive, so it is not prohibitive to use 4-6
per
injector.
3. The machinist intentional ground a score line around each drill
bit shank. That way if they broke off in the injector, the break point
was
outside the material, and the broken part of the drill bit could be
removed
with pliers.
At one point I made a 3-D printable version of this injector. The
vendor printed the sample shown in the attached images. The surface finish
of the small orifices is NOT great. The orifices diameters were printed
0.010” undersized, with the intention of using a precision reamer to get
a
nice clean, smooth orifice. A lot of material goes away, so it was a very
light part. A complete printed injector never materialized, since the
price
per weight savings didn’t merit it. Maybe I will revisit this design some
day on a larger motor.
--- Carl
*From:* arocket-bounce@xxxxxxxxxxxxx <arocket-bounce@xxxxxxxxxxxxx> *On
Behalf Of *1bcjolly
*Sent:* Tuesday, August 11, 2020 4:25 PM
*To:* arocket@xxxxxxxxxxxxx
*Subject:* [AR] LR-101 injector
Some pictures of LR-101 injector
Sent from my Sprint Tablet.
