1:24 Heywood Wheel & PAP Project...

[Craig_H]

  76.00 bucks seems like alot? wonder what chucks gas pump cost? I don't think chuck mentioned the cost.      Craig

[RoughboyModelworks]

Yes, I was a little surprised about the cost. I was thinking in the $40-$50 range. Pricing depends on the space you take up on the printing platform plus the amount of material used. Since these wheels are fairly large parts (compared to some of the things the other guys are doing here), that would explain the higher cost. They are also much more complex objects which resulted in a large complex STL file (60 megs and over 1,000,000 facets). That could have been a contributing factor as well.

Paul

[marc_reusser]

I really look forward to your results.

If anyone is interested, I did a quick check of the Fineline site and using their comparison function, did one of three of their printers, ranging from the top of the line Viper HR...to the upper middle IPRO, and the one used for PAP (INVISION HR).... the page loads slow, but you can see some comparison images from all angles of assorted parts details  for the tha same piece made on each machine.

http://www.finelineprototyping.com/intro/compare-technologies.php?technologies%5B%5D=viperhr&technologies%5B%5D=ipro&technologies%5B%5D=invisionhr


Marc

[Chuck Doan]

The pump body was around forty bucks. Approx. .625 diameter and 3" long. So far, the pricing still kicks ass over the time of scratchbuilding, plus a superior end result. I could never do the lettering on the gallon indicators I printed.

[Craig_H]

Chuck,  I agree about the time issue....scratch building something i would use PAP to..... if i knew how to do all the computer work....drawing and such     Craig

[RoughboyModelworks]

I've made, I think, a prudent tactical change with this. Decided to print just one wheel center the first time out because of concerns I have about concentric accuracy and crispness of the raised lettering. Fortunately I was able to cancel the previous order and add this one to the queue. If necessary I may have to bump up the font size and weight slightly. The cost for the one wheel center is $32, which though pricey enough is better than spending $76 on a test and getting four centers that aren't satisfactory. I added a small center hole to test for concentric accuracy in the lathe. If successful I'll go back to the original plan and print the four centers at one time and use this one as a test piece for machining and painting.



I agree Chuck, compared to the time it would take to machine each of these individually, the price is a bargain. Plus I would have no way to machine the lettering which is an important detail.

Paul

[RoughboyModelworks]

Just for S & G I prepared a cut-away rendering of the wheel assembly, primarily to confirm the proper wheel contours. Even though the prototype wheels were cast as one piece, I'm differentiating between the tire and center as that is how I intend to produce the wheels for the Van: PAP resin center with machined nickel-silver tread.



Paul

[finescalerr]

Satisfactory. -- Russ

[RoughboyModelworks]

Just received confirmation that the wheel center has been printed and is on the way... should be here by the end of the week...

In the meantime I've been working on the journal box drawings... should have those finished up in the next day or so.

Paul

[RoughboyModelworks]

Received the test wheel center today from the rapid prototyper. Photo below shows the center as it arrived, directly out of the package.



I tested the concentric accuracy of the wheel in the lathe and found it to be excellent, well within the tolerances needed for the project. I bored the axle hole in the lathe and mounted the wheel temporarily on a piece of scrap brass stock.



To better assess the crispness of the lettering and printing texture, I painted the part with my base Floquil rust mixture. Prior to painting I gave it a gentle soda blast and wash in denatured alcohol to removed any remaining wax from the printing process.



I need to raise the lettering slightly from the surface of the wheel as the baseline edges of the lettering (closest to the hub) are a little too soft. This will help make the lettering more distinct. The texture I find quite acceptable considering this is a 1:12 scale part meant to replicate a cast iron wheel. In any smaller scale I think it would be too coarse. As it is, under normal room illumination, the texture is barely discernible. For reference, the part diameter is just over 1".

Paul

[Gordon Ferguson]

Paul,

as I said elsewhere that is a brilliant result , well done .......... can't really imagine being able to get this quality of finished product without using all the latest techniques that you obviously have mastered.

[Ray Dunakin]

Man, that looks great!

[finescalerr]

A successful experiment. -- Russ

[james_coldicott]

Paul,

I agree- a great result. The texture is very close to many of the cast wheels I've seen over the years and will add an extra dimension to the finished model.

James

[jacq01]

  very good and I admire the ability to produce and present these CAD drawings. 
  I will have to cheat in this sort of model part production by having all the CAD work done by a friend.

  I love these fine results........... but it is outside the modelling where my heart lies. Maybe due to the lack of experience in CAD and the impatience to learn how to draw again ??
 
   Jacq