Lexan molding tips and things
- Dr. Robotnik
- Approved Member
- Posts: 1442
- Joined: Wed Oct 11, 2006 11:05 am
- Location: Nutterham, United Kingdom
- Been thanked: 2 times
Lexan molding tips and things
Hi all,
I am fingers crossed getting sent an original radio box lid for the Hobby Products nitro 1/8th car I found at the junk shop.
This came about because I asked the owner of one if he would take a mold for me and send me the mold so I could make a repro. He said he'd rather send it to me to mold!!!
The part is the clear lexan lid on the yellow box. My question is how can I make a mold from it and return it to him in the same pristine condition I receive it? Can you let me know the names of molding plasters (or whatever the correct term is) and release mechanisms so it'll be perfectly preserved.
Thanks a lot in advance.
Cheers
Ed
P.S. I have also found a 1/8th Porsche shell to suit this car and hope it'll be a fun restore with a little cleaning!
I am fingers crossed getting sent an original radio box lid for the Hobby Products nitro 1/8th car I found at the junk shop.
This came about because I asked the owner of one if he would take a mold for me and send me the mold so I could make a repro. He said he'd rather send it to me to mold!!!
The part is the clear lexan lid on the yellow box. My question is how can I make a mold from it and return it to him in the same pristine condition I receive it? Can you let me know the names of molding plasters (or whatever the correct term is) and release mechanisms so it'll be perfectly preserved.
Thanks a lot in advance.
Cheers
Ed
P.S. I have also found a 1/8th Porsche shell to suit this car and hope it'll be a fun restore with a little cleaning!
- Tadracket
- Approved Member
- Posts: 1302
- Joined: Sun Feb 18, 2007 10:57 pm
- Location: Southport North Carolina
Re: Lexan molding tips and things
On a part that simple, I poor it with plaster of paris and let it dry for a while. Not a great mold for thin pieces as it is brittle. Make sure you mix it properly if you go that route for the best strength.
I am sure someone here has a better method. I tried fiberglass jelly with a driver figure an it was a pain trying to get it to release. But I did not use a release agent either. I am still learning stuff and need to get my garage cleaned so I can set everything back up and start making stuff.
Sorry I can't be more helpful. Good luck.
I am sure someone here has a better method. I tried fiberglass jelly with a driver figure an it was a pain trying to get it to release. But I did not use a release agent either. I am still learning stuff and need to get my garage cleaned so I can set everything back up and start making stuff.
Sorry I can't be more helpful. Good luck.
He's an idiot. Comes from upbringing. His parents are probably idiots too.
- templeofspeed
- Approved Member
- Posts: 2087
- Joined: Tue Aug 01, 2006 10:02 pm
- Location: Central Ohio
- Been thanked: 8 times
Re: Lexan molding tips and things
Wow, glad you're going to give that beast some TLC... I figured you would've binned it by now...
[/sarcasm]
[/sarcasm]
- Dr. Robotnik
- Approved Member
- Posts: 1442
- Joined: Wed Oct 11, 2006 11:05 am
- Location: Nutterham, United Kingdom
- Been thanked: 2 times
Re: Lexan molding tips and things
As for plaster of paris as suggested by Tad, I used it when I was a lad on a Hornet shell and couldn't get it to release so I'd need more info. on some sort of release agent before I try that again...
Hmm is the sarcasm thing going into rc10talks long running list of jokes along with Vera, 4000 white parts, etc, etc...at least I've finally made it I guess
I think if I replace the hardware on the car, a new shell and give it a clean you'll be surprised how good it will look. I am sorely tempted to run it in the end too (although I'll have to work out how a nitro engine works)!
Hmm is the sarcasm thing going into rc10talks long running list of jokes along with Vera, 4000 white parts, etc, etc...at least I've finally made it I guess
I think if I replace the hardware on the car, a new shell and give it a clean you'll be surprised how good it will look. I am sorely tempted to run it in the end too (although I'll have to work out how a nitro engine works)!
- Tadracket
- Approved Member
- Posts: 1302
- Joined: Sun Feb 18, 2007 10:57 pm
- Location: Southport North Carolina
Re: Lexan molding tips and things
There are several release waxes available on the market. Google it and you should get a bunch of stuff. I have never had a problem though with lexan releasing from P of P.
If you go with the wax, make sure it will not scratch the lexan. I have heard of people sprinkling the lexan with baby powder. Never tried it though.
If you go with the wax, make sure it will not scratch the lexan. I have heard of people sprinkling the lexan with baby powder. Never tried it though.
He's an idiot. Comes from upbringing. His parents are probably idiots too.
- templeofspeed
- Approved Member
- Posts: 2087
- Joined: Tue Aug 01, 2006 10:02 pm
- Location: Central Ohio
- Been thanked: 8 times
Re: Lexan molding tips and things
It's certainly been run before, I'd sure give it a rip around the yard.
- Halgar
- Approved Member
- Posts: 3324
- Joined: Tue Feb 07, 2006 12:34 pm
- Location: USA
- Has thanked: 151 times
- Been thanked: 191 times
Re: Lexan molding tips and things
Interesting find and motor configuration. Curious to see if you'll be able to breath some life back into that thing (the motor, not the rc ).
klavy69 wrote:... when I give you s&#t its a loan...I want it back!
- Dr. Robotnik
- Approved Member
- Posts: 1442
- Joined: Wed Oct 11, 2006 11:05 am
- Location: Nutterham, United Kingdom
- Been thanked: 2 times
Re: Lexan molding tips and things
Halgar wrote:Interesting find and motor configuration. Curious to see if you'll be able to breath some life back into that thing (the motor, not the rc ).
I am not sure whether the motor might be shot, the exhaust bolt mounts are cracked and stripped, but if it can run without a manifold I don't see why not...it's hard to say what is missing on this car though as I don't have a manual and haven't had a 1/8th nitro before...we'll see I guess.
- Tadracket
- Approved Member
- Posts: 1302
- Joined: Sun Feb 18, 2007 10:57 pm
- Location: Southport North Carolina
Re: Lexan molding tips and things
Don't know if that will work or not. The back pressure created by a manifold helps the 2 cycle engines operate properly. I know with my old dirt bikes, they would not run without the exhaust connected.Dr. Robotnik wrote:.....but if it can run without a manifold I don't see why not...
If you can get it running, don't expect any real power as the pipe is what creates that lovely 2 stroke "Power Band". If you listen to Shodogs video of the 5B, you can here the car "getting on the pipe" when it reaches that optimal RPM where the exhaust creates the perfect back pressure for the motor.
I think I did a poor job of explaining this. Maybe someone with a more intelligent mind can do it .
I found a link that cover expansion chambers pretty good.
http://www.motorcycle.com/how-to/how-twostroke-expansion-chambers-work-and-why-you-should-care-3423.htm
He's an idiot. Comes from upbringing. His parents are probably idiots too.
- Dr. Robotnik
- Approved Member
- Posts: 1442
- Joined: Wed Oct 11, 2006 11:05 am
- Location: Nutterham, United Kingdom
- Been thanked: 2 times
Re: Lexan molding tips and things
Yep that's what I thought to but never having run a nitro car I didn't know if they were the same or not...oh well I'll just ebay a new pipe I guess...Tadracket wrote:The back pressure created by a manifold helps the 2 cycle engines operate properly. I know with my old dirt bikes, they would not run without the exhaust connected.
- templeofspeed
- Approved Member
- Posts: 2087
- Joined: Tue Aug 01, 2006 10:02 pm
- Location: Central Ohio
- Been thanked: 8 times
Re: Lexan molding tips and things
Scale two-cycle nitro engines have been successfully run without manifolding for a looong time.
Loud=fast.
Old tether cars, airplanes, boats... No worries for a test.
I would strongly recommend a complete disassembly of the motor to inspect for corrosion and to degum the works, etc. Nitro fuel is largely alcohol based, which attracts water...and the nitromethane is corrosive...
Alternatively, if it came down to it I'm sure a period .19-.21 engine can be found in the usual places.
What engine is on that, OPS?
Loud=fast.
Old tether cars, airplanes, boats... No worries for a test.
I would strongly recommend a complete disassembly of the motor to inspect for corrosion and to degum the works, etc. Nitro fuel is largely alcohol based, which attracts water...and the nitromethane is corrosive...
Alternatively, if it came down to it I'm sure a period .19-.21 engine can be found in the usual places.
What engine is on that, OPS?
- Dr. Robotnik
- Approved Member
- Posts: 1442
- Joined: Wed Oct 11, 2006 11:05 am
- Location: Nutterham, United Kingdom
- Been thanked: 2 times
Re: Lexan molding tips and things
What is the best degumming thing to use on this car, engine and the alloy parts, I was just going to go for petrol and a soak then try scrubbing it off.
I think the engine is an OPS .13
I have been told to look at Webra Speed 20, OS Max 21, Enya car engines 19-21 if I can't get mine to work...
I think the engine is an OPS .13
I have been told to look at Webra Speed 20, OS Max 21, Enya car engines 19-21 if I can't get mine to work...
- templeofspeed
- Approved Member
- Posts: 2087
- Joined: Tue Aug 01, 2006 10:02 pm
- Location: Central Ohio
- Been thanked: 8 times
Re: Lexan molding tips and things
Straight petrol or white spirit (lacquer thinner?). Clean, dry, spray with WD40.
- SoloGraphix
- Approved Member
- Posts: 203
- Joined: Sun Sep 09, 2007 7:25 pm
- Location: New F'n Jerzey!
Re: Lexan molding tips and things
Nitro Clean is what I use to clean all my nitro engines. It is readily available at any LHS and cuts thru nitro gunk with relative ease. I recently got a NitroDS with an OS .12 CV that was locked up solid from build-up. A quick disassembly and thorough cleaning with Nitro Clean had then engine screaming when it was put back together and started.
- Dr. Robotnik
- Approved Member
- Posts: 1442
- Joined: Wed Oct 11, 2006 11:05 am
- Location: Nutterham, United Kingdom
- Been thanked: 2 times
Re: Lexan molding tips and things
ooooooohhhhh Nitro clean huh? I'll have a look at my LHS asap
Thanks for the tip mate.
Thanks for the tip mate.
Create an account or sign in to join the discussion
You need to be a member in order to post a reply
Create an account
Not a member? register to join our community
Members can start their own topics & subscribe to topics
It’s free and only takes a minute
Sign in
-
- Similar Topics
- Replies
- Views
- Last post
-
- 4 Replies
- 553 Views
-
Last post by Brandon G
-
- 9 Replies
- 759 Views
-
Last post by dangermouse
-
- 1 Replies
- 336 Views
-
Last post by Dadio
-
- 10 Replies
- 2745 Views
-
Last post by MelvinsArmy
-
- 19 Replies
- 2363 Views
-
Last post by THUNDERSTRIKE1
-
- 1 Replies
- 592 Views
-
Last post by RichieRich
-
- 13 Replies
- 1244 Views
-
Last post by juicedcoupe
-
- 4 Replies
- 704 Views
-
Last post by RC10th
Who is online
Users browsing this forum: No registered users and 1 guest