Won't oiling the steel prevent rusting?
On Sun, 31 Mar 2019, 1:16 AM Bill Kuker, <bkuker@xxxxxxxxxxxxx> wrote:
I just use whatever garbage steel is floating around, abuse it, clean it a
month later, sand off some of the surface rust and use it again.
No complaints :)
On Sat, Mar 30, 2019 at 6:33 PM Rick Maschek <dmarc-noreply@xxxxxxxxxxxxx>
wrote:
My lathe is late 40s/early 50s and I use a lantern post with HHS.
I also have another tool holder I use for carbide when needed.
I use both for doing 303...I never use coolant but probably should for
maximizing tool life...easy to sharpen HHS
On Saturday, March 30, 2019, 2:14:26 PM PDT, Kelly Jones <
kellyjones1@xxxxxxxxx> wrote:
Can these be machined with HSS tooling?
(I have an ancient lathe with a 'lantern' style tool holder, and the
angle this presents makes it unsuitable for most carbide tooling I've seen
- easier to grind my own HSS tooling)
On Sat, Mar 30, 2019 at 1:58 PM Ben Brockert <wikkit@xxxxxxxxx> wrote:
303 and 416 are both totally reasonable to machine; 303 is identical
in machinability to 1018 and 416 is better, per
http://www.carbidedepot.com/formulas-machinability.htm . It does take
more power than aluminum, so really cheap belt drive or plastic gear
benchtop lathes may have problems.
304 or 316 are worse but still can be done, having the speeds and
feeds right with the correct tool makes a lot of difference. They're
not free machining, but they weld a lot better, and in larger sizes of
nozzle making it becomes cheaper to make it with a mix of welded and
lathed parts.
On Sat, Mar 30, 2019 at 4:19 PM Rick Maschek
<dmarc-noreply@xxxxxxxxxxxxx> wrote:
if not cleaned, dried, and perhaps a bit of oil to prevent rusting. A
Here's my two cents...I used a variety of steels but they all corrode
former friend told me years ago that you can't machine stainless steel,
that it took special expensive equipment to do so and I always wondered
about that. Then I got my own lathe and was able to pick up some 303
stainless as a remnant (when metal stores get to the end of bar stock and
can no longer cut things from it because of it's length or they have pieces
that were cut wrong for an order. I paid/pay $2,89 a pound for it at the
metal shop I use.
can fire a motor and if I don't get around to cleaning it up right away, no
I like turning it more than I do 6061-T6. I love the look of it and I
big deal. To clean I simply drop the nozzle into a bucket of water and
rinse off. I don't even have to dry or oil it as it does not rust. I have
one 3" nozzle with over 25 firings (static tests and flights) that includes
3 CATOs and it looks great.
Peterson <dmarc-noreply@xxxxxxxxxxxxx> wrote:
Rick
On Friday, March 29, 2019 05:35:43 PM PDT, Steve
DMARC) wrote:
OOps! Typo. 1080 should be "1018". Sorry....
--Steve
On 3/29/19 5:32 PM, Steve Peterson (Redacted sender steve_peterson for
machining stainless, go ahead :-)
1080 (aka "CRS" -- cold rolled steel). But if you actually *like*
A slightly more machinable alloy is "12L14" also known as "ledloy"which has a tiny amount of lead added to the steel to make it more
machinable. I've used both and seen no difference in erosion or other wear.
--Stevedmarc-noreply@xxxxxxxxxxxxx> wrote:
On 3/29/19 4:54 PM, William Schmiedlin wrote:
This is great news!
What alloy are people using? 300 series stainless steel?
Regards,
William Schmiedlin
On Wed, Mar 27, 2019, 10:45 AM Rick Maschek <
be aware.
Somehow I thought this had been announced here. Some of you may already
This is a post by Steve Shannon, TRA President on the TRA forum fromlast month:
amending the Tripoli Research Safety Code to allow steel nozzles for use
"At LDRS 36 in 2017, Rick Maschek requested the Board to consider
with sugar motors used at Tripoli Research Launches. At the time we
requested that he provide data to our Tripoli Research Committee Chair, Dr.
Terry McCreary, to demonstrate that the use of sugar motors would not
increase risk. The concern as I understand it is that the additional
density of steel would lead to increased momentum and thus greater range in
the event of a nozzle being spit. The counter to that is that nozzles in
properly flying rockets are spit downward rather than horizontally. For
static tests it's possible to require that they be held vertically so the
direction of a spit nozzle would be vertical and thus have limited
horizontal range. NFPA does not prohibit steel nozzles.
several times, but we never did really receive data.
Since that time Rick and Terry and I have discussed this electronically
risk when used for sugar motors as long as all other rules are followed.
Honestly, most of us don't feel that steel nozzles necessarily increase
So, rather than leaving this unresolved, Terry proposed that weprovisionally allow the use of steel nozzles with sugar motors for both
static burns and flights as long as the static burns are vertical. The
board voted on his proposal last week and it passed easily.
year (2019). During that time we want Prefects and users to come to this
The motion was for steel nozzle usage to be allowed for this calendar
thread and relate any first hand accounts about their use of steel nozzles,
both good and bad, and especially observations about spit nozzles. Of
course for flights, an angled blast deflector could redirect a spit nozzle,
so observations about that should also be made. At the end of 2019 Terry
and the board will review the data and make a determination whether to
incorporate that change permanently in the Tripoli Research Safety Code. If
we do nothing, this provisional permission to use steel nozzles will expire
at the end of 2019.
I should also point out that this is not mandatory. Local Prefects havethe latitude to ban the use of steel nozzles at their home fields. Local
Prefects always have the authority to adopt policies that exceed NFPA and
the Tripoli Safety Codes."
Rick
