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Construction Equipment If it digs, pushes, hauls dirt "off road" post it here. |
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1/14 CAT 390D LME
Hi Guys, I have recently Started building an all aluminum 1/14 scale 390D LME. Progress will be slow as I am making everything on a manual mill and lathe and this will be the first time I have ever used a mill or lathe. -Jeff
Prototype for the track pads. Still needs some work. Drive line parts so far. Roller cut from 7/8 rod. Still need to cut 17 more. Was going to make the drive hub 1 piece but I could not find anyway to turn a 3inch dia. rod with my micro lathe. Seems all the chucks only hold 2.4 inchs or so. Anyway I will be makeing it out of three pieces. |
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Re: 1/14 CAT 390D LME
Undercarriage so far.
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Re: 1/14 CAT 390D LME
Wow looks like a great start so far! You'll be a master at the mill and lathe by the time your done with with build. Keep up the great work
__________________
Hi my name is Aaron.... And i'm a truckaholic! |
#4
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Re: 1/14 CAT 390D LME
Nice to see someone building 390. When I started building CAT 374 my other choice was 390, but It's so big in 1:14 scale that I end up doing slightly smaller 374.
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Ari To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. |
#5
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Re: 1/14 CAT 390D LME
I started designing 390 just few weeks ago. It will be interesting to see what you come up to and also get some ideas from you. Are you using any CAD system for help? What mill/lathe do you have?
Post some pics of machining next time too! Good luck! |
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Re: 1/14 CAT 390D LME
Another nice bucket build to follow, keep up the good work!
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Giving up is not an option!!! Rob |
#7
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Re: 1/14 CAT 390D LME
Thanks guys.
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Indeed I hope to make myself a nice ME bucket like Ari's 374D. Can't promise it will be as nice as his though. |
#8
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Re: 1/14 CAT 390D LME
Start of the bolt pattern. First time using a rotary table. Didn't know till half way through I was .010 off center. Its barely noticeable. I'm not liking this latest version of photobucket at all.
Last edited by Jw.; 10-19-2012 at 05:43 AM. |
#9
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Re: 1/14 CAT 390D LME
Second bolt pattern. Now this one I was dead on for sure this time and it came out perfect.
44 holes drilled and tapped. Plus 24 teeth cut. I will eventually switch the screws over to hex head but for now cheap socket head screws will do. Last edited by Jw.; 10-19-2012 at 06:57 AM. |
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Re: 1/14 CAT 390D LME
First attempt at making a 2 piece mold for the track pad and link bolted together out of a plaster cast. Since I don't have a cnc machine.
I was not sure if it was going to work and it didn't. It failed and cracked. The plaster it still slightly pliable after it sets(30 minutes or so) so I thought I might be able to slide it out ok. Even if I had added more water to soften it even more. The undercut on the track pad still would have deformed the mold. It was just a test anyway to see how the whole process goes. The search is on for other methods. I'm considering lost wax, lost foam, or prototype metal mold casting. I will find a way to get this done. 102 track pads to go. On the left side mold. On the bottom of the track pad is where the undercut is. That's where it cracked on me. Also I forgot to make a sprue or vent holes. Last edited by Jw.; 10-19-2012 at 06:53 AM. |
#11
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Re: 1/14 CAT 390D LME
Wow that final looks great! Can't wait to see the rest of it
__________________
Wedico Cat 966G King Hauler (hopefully soon) 2001 Dodge 2500, 24 Valve Cummins 1973 Plymouth Road Runner 1967 Ford Galaxie 500 1966 Chevy Bel Air |
#12
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Re: 1/14 CAT 390D LME
Dude, you used mill for the first time and made that nice sprocket? You are a serious talent!
From where do you get your tips on how to mill? Keep it up, seems very promising |
#13
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Re: 1/14 CAT 390D LME
Great project! It is going to be really interesting, especially the casting part.
Kerst |
#14
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Re: 1/14 CAT 390D LME
i have a few links about making sand molds to do what you need ,let me know if you want them ,
but the best way is doing lost wax and using a wax tree and casting thirty or more at one time in a investment mold , and by the way plaster of paris will cause a exploration of hot metal because you can't bake all of the water out of it . |
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Re: 1/14 CAT 390D LME
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Thanks Kerst. Casting has been quite difficult but I think I might have figured it out. |
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Re: 1/14 CAT 390D LME
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#17
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Re: 1/14 CAT 390D LME
My first negative silicone mold attempt that I'll use to make a positive silicone. Them I'll use it to make my negative plaster mold. In the final third picture, the mold came out quite well except for a few bubbles around the bolts. This was a result from most likely not vacuum degassing the silicone before I poured. I would have except I have yet to make a vacuum chamber and get myself a pump. Those are on the list next. |
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Re: 1/14 CAT 390D LME
Second attempt was a failure again but I'm getting closer. Air bubbles all over and it cracked. Third plaster mold attempt. Once again there were a few tiny bubbles in the silicone that can be seen as imperfections on the edge of the track pad. Third time worked. Almost. Although it did not crack on me I still have a few air bubbles. Again I'm sure I can easily take care of those once I get my vacuum chamber built. |
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Re: 1/14 CAT 390D LME
So the plaster castings might be good for how many liquid metal pours? And what type of metal will you be using?
__________________
Sharing knowledge is one thing that defies basic arithmetic logic --- the more you share, the more you get! Joe |
#20
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Re: 1/14 CAT 390D LME
10 to 15 pours per mold I am guessing. I was going to use aluminum A356 but I'm concerned about durability so I will be using Zinc Alloy 27. It is stronger and has a tensile strength of cast iron.
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