RE: Dedicated MH Roller Replacement - Finished.

It should be .3125, Just checked the model and it was right. I had the
bearing modeled and its OD is right on the money, the bearing support is
referenced to that. Not sure what happened to the print to make the
dimension come out wrong. I will update the .pdf on my site sometime
tonight.

The 0.188 hole on the encoder shaft is to pin it down while you thread in
the disc. I just put one in the idler shaft to be consistent. I actually
made mine without either hole. CRS should work fine, growing a few
thousandths case on the shaft would be ideal, but I have a feeling that they
will hold up well without it.

                        James

-----Original Message-----
From: Mark E Davidson [mailto:Burbs1@concentric.net]
Sent: Friday, March 03, 2000 6:27 PM
To: vectorlist@synthcom.com
Subject: Re: VECTOR: Dedicated MH Roller Replacement - Finished.

DAD! I mean James!
    Quick question. Why are the dimensions for the bearing holders off?
Going in
a 1/2 inch and doing a radius of .308 gives a bearing clearance of .618 not
.625
and what is the purpose of the .188 holes in the shaft? I can see the hole
for
holding the shaft for putting on the encoder wheel but why in the other
roller.
I spun down a rod for 1/2 CRS for my shafts

James Marous wrote:

> Very, very cool! Feeling a little like a proud parent right now :-)
>
> To answer a couple questions: I did buy new bearings for mine, but they
> are identical to the ones used in the Centipede type mini trakball. The
> McMaster-Carr Part # is: 57177K38 and are $5 each. There are probably
> cheaper bearings available, if you want to try and find something, the
> dimensions you need are 0.250 ID, 0.625 OD and 0.196 width.
>
> I did make provisions for a light, there is a 3/4" hole in the base for a
> bulb to shine through. I have not yet wired mine up. The only problem
> might be that the base is not completely enclosed. This is easy to fix,
> either with a sheetmetal enclosure or just temporarily with cardboard. I
> can model up some side panels if anyone is really interested. The
interior
> surfaces of the roller might also need to be painted black, not sure if
> having reflective surfaces in there would hurt or not.
>
> The roller studs were just standard #8 carriage bolts that I had lying
> around. I just polished the heads and coated them with some liquid
teflon.
>
> Let me know the details of how your prototype went together. The prints
you
> had contained some minor tweaks of the first prototype.
>
> If you do a production run, lmk... I might buy one just to see how it
turned
> out.
>
> James
>
> -----Original Message-----
> From: Mark E Davidson [mailto:Burbs1@concentric.net]
> Sent: Friday, March 03, 2000 5:30 PM
> To: vectorlist@synthcom.com
> Subject: Re: VECTOR: Dedicated MH Roller Replacement - Finished.
>
> Ok I guess Im confused as well. What is the demand for just the roller and
> what it the
> demand for the whole thing? Hands please. Im working on just rollers right
> now. MY
> personal goals at this point is to add a roller to a SD -> MH conversion.
> The spinner
> is not cutting it with the exception of the breakout part of the game. :-)
I
> have a
> mostly complete set up right now, missing the encoder wheel and
electronics
> and the
> bearing.
> Look as http://www.basementarcade.com/arcade/library/vlist/mymhroller.jpg
>
> -=Mark=--
>
>
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Received on Fri Mar 3 17:18:53 2000