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Jumbo Ball Hopper Monitor

Jumbo Ball Hopper Monitor

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PatJ10/03/2019 17:26:17
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39 forum posts
27 photos

I am also printing some patterns for a jumbo ball hopper monitor IC engine.

The pattern is about 13" diameter, and after double shrinkage and machining it should finish out at about 12" diameter.

I will cast permanent pattern halves in 356 aluminum.

The 3D model was created in Solidworks.

The spokes are not true ellipsoidal, because lofting those is problematic, but I will sand the spokes on the pattern to an ellipsoidal shape before casting the flywheel in gray iron.

flywheel-02.jpg

rimg_3091.jpg

rimg_3093.jpg

JasonB10/03/2019 17:31:30
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Looks good Pat, is this for the VJ or one of the larger Monitors?

PatJ10/03/2019 18:15:00
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39 forum posts
27 photos

I have the VJ on my list, and I think the flywheel is close enough that I could use it on a VJ or a Ball Hopper, but this flywheel print will be used for the Ball Hopper Monitor.

I will attach a photo which I think is one of your builds.

Also attached are the beginnings of some of the other 3D models for this engine.

imag2545_zps13f55dae.jpg

 

gas-tank-01.jpg

 

hopper-01.jpg

Edited By PatJ on 10/03/2019 18:15:23

PatJ10/03/2019 18:17:40
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39 forum posts
27 photos

I think that first screencap I posted was an early 3D model for the flywheel.

This one seems to be my latest version, and I think is the one I used to print with.

ball-monitor-flywheel-rev-02.jpg

PatJ10/03/2019 18:22:09
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39 forum posts
27 photos

Here is the logo that I carved out of a block of linoleum.

It is flexible, so I will adhere it to the gas tank before I make a casting.

rimg_9110.jpg

JasonB10/03/2019 18:39:32
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That's going to be quite a beast based on the size of the one I made. You may want to cast in the balancing grooves as they need a fair sized rotary table if they are going to be milled though my Soba coped ok with the 9" radius and 11mm bull nose cutter.

What will you do about the clamping bosses on the hub?

PatJ10/03/2019 19:32:04
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39 forum posts
27 photos

In my haste to find new things to try out on the printer, I neglected to include the hub clamping bosses and spoke bosses, and so I will have to add those to the plastic patterns before I make the aluminum permanent pattern.

For the balancing grooves, at this point I could gouge them out of the plastic, or cut them in the permanent aluminum pattern.

I may make a rough cut for the grooves in the plastic that is undersized, and clean it up in the aluminum pattern.

Thanks for pointing that stuff out.

Small but important details for sure.

JasonB10/03/2019 20:01:41
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14864 forum posts
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Also the bosses for the governor weight and spring on one wheel and the bosses for the take off pulley on both will be needed

PatJ10/03/2019 20:59:40
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39 forum posts
27 photos

Thanks, looks like I have a bit of work to do before trying a casting.

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