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[casting] Digest Number 3406

Messages In This Digest (11 Messages)

Messages

1a.

Re: roto-caster: trying to get my bearings...

Posted by: "DOC" doc@sympatico.ca   torobots

Tue Feb 12, 2008 1:03 pm (PST)

At 12:22 AM 2/12/2008 -0500, you wrote:

I hope this doesn't sound like I have too much smoke up my
backside but I am capable of making pulleys out of just about
anything machinable.

It's just that if I can get em for a few dollars each then I prefer
to go that route.

But it does get me to wondering how you would get 28 divisions
off an indexing head...
:-)

DOC

>You can make pulleys out of good plywood if the RPMs aren't too high.
>
>Rexarino wrote:
> >

Buy my junk! http://www3.sympatico.ca/doc/robotone/for-sale.html

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1b.

Re: roto-caster: trying to get my bearings...

Posted by: "DOC" doc@sympatico.ca   torobots

Tue Feb 12, 2008 1:41 pm (PST)

We have a place called TSC in the area. They are a farm supply store.

There's also Princess Auto. It has some farm stuff and a fair bit of
mostly lower grade tools.

Sometimes they are really handy. But neither seem to stock smaller
bearings or drive components.

Neither carry #25 roller chain for example.

Humm...
I suppose I could try sprockets and chain but I like the timings
belt solution better.

Thanks,
DOC

At 09:19 PM 2/11/2008 -0800, you wrote:

>Farm supply stores still understand that people build things, and often have
>reasonable prices.
>
>On Feb 11, 2008 6:02 PM, DOC <<mailto:doc%40sympatico.ca>doc@sympatico.ca>
>wrote:

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Messages in this topic (11)
1c.

Re: roto-caster: trying to get my bearings...

Posted by: "Rodney Grantham" granthams@wiktel.com   rodney_grantham

Tue Feb 12, 2008 1:56 pm (PST)

<snip>
> But it does get me to wondering how you would get 28 divisions
> off an indexing head...
> :-)
>
>
> DOC
>

On a 40 to 1 dividing head, using the 49
indexing circle, you make one complete turn
plus 21 holes. There is a demonstration of
a dividing head on YouTube. Point your browser
to http://www.youtube.com/watch?v=VHTXaU7GZC0
to watch "Machining a Spur Gear"

Rod

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Messages in this topic (11)
1d.

Re: roto-caster: trying to get my bearings...

Posted by: "DOC" doc@sympatico.ca   torobots

Tue Feb 12, 2008 8:46 pm (PST)

Thanks for the pointer.

It did occur to me that a plate with any number that's devisable by 7
will work.

Yeah! I know. I can machine my own bevel gears also!
Listen. I'm just trying to get a roto-caster done!
:-)ooo

DOC

At 09:56 PM 2/12/2008 +0000, you wrote:

><snip>
> > But it does get me to wondering how you would get 28 divisions
> > off an indexing head...
> > :-)
> >
> >
> > DOC
> >
>
>On a 40 to 1 dividing head, using the 49
>indexing circle, you make one complete turn
>plus 21 holes. There is a demonstration of
>a dividing head on YouTube. Point your browser
>to
><http://www.youtube.com/watch?v=VHTXaU7GZC0>http://www.youtube.com/watch?v=VHTXaU7GZC0
>to watch "Machining a Spur Gear"
>
>Rod
>
>

Buy my junk! http://www3.sympatico.ca/doc/robotone/for-sale.html

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Messages in this topic (11)
2a.

Small prototype piece help please

Posted by: "iwillinvent" amy@nwcomputer.com   iwillinvent

Tue Feb 12, 2008 1:15 pm (PST)

Hello. I am designing my first product. For part of this prototype, I need an 1/8-
inch inner diameter tubular piece. The wall of the tube is not thick, maybe 1/16- or 1/8-
inch. This piece is going over the side pieces of some eyeglasses frames, so I need it to
stretch to fit, or I may slit it down the middle to make it easier to put on.

I know this piece can be molded, but I am concerned about the expense. Is
there a less expensive way to do this for a prototype piece?

Any information about creating this piece will be appreciated.

Regards,

Amy

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Messages in this topic (5)
2b.

Re: Small prototype piece help please

Posted by: "DOC" doc@sympatico.ca   torobots

Tue Feb 12, 2008 1:54 pm (PST)

These the rubber things that fit on the back of the temples? Help
keep the glasses from slipping off your face?

Check some outdoor equipment stores. In Canada we have
Mountain Equipment Coop. They sell mountaineering sun
glasses with this type of rubber fittings.

Last time I needed some they gave me a few. They wear out
in about six months though. So I have stopped using them.

DOC

At 06:31 PM 2/12/2008 +0000, you wrote:

>Hello. I am designing my first product. For part of this prototype, I need
>an 1/8-
>inch inner diameter tubular piece. The wall of the tube is not thick,
>maybe 1/16- or 1/8-
>inch. This piece is going over the side pieces of some eyeglasses frames,
>so I need it to
>stretch to fit, or I may slit it down the middle to make it easier to put on.
>
>I know this piece can be molded, but I am concerned about the expense. Is
>there a less expensive way to do this for a prototype piece?
>
>Any information about creating this piece will be appreciated.
>
>Regards,
>
>Amy
>
>

Buy my junk! http://www3.sympatico.ca/doc/robotone/for-sale.html

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Messages in this topic (5)
2c.

Re: Small prototype piece help please

Posted by: "Steven Guevara" a3dcreator@gmail.com   stevalucho

Tue Feb 12, 2008 3:18 pm (PST)

go to a cheap prototyper.
http://wickedresin.com/shop/pc/viewcontent.asp?idpage=5

get a good low price on your prototype.
and then make the molds yourself for it.

On Feb 12, 2008 10:31 AM, iwillinvent <amy@nwcomputer.com> wrote:

> Hello. I am designing my first product. For part of this prototype, I
> need an 1/8-
> inch inner diameter tubular piece. The wall of the tube is not thick,
> maybe 1/16- or 1/8-
> inch. This piece is going over the side pieces of some eyeglasses frames,
> so I need it to
> stretch to fit, or I may slit it down the middle to make it easier to put
> on.
>
> I know this piece can be molded, but I am concerned about the expense. Is
> there a less expensive way to do this for a prototype piece?
>
> Any information about creating this piece will be appreciated.
>
> Regards,
>
> Amy
>
>
>

[Non-text portions of this message have been removed]

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Messages in this topic (5)
2d.

Re: Small prototype piece help please

Posted by: "DOC" doc@sympatico.ca   torobots

Tue Feb 12, 2008 8:52 pm (PST)

Or just use some bits of rubber tubing available from your
local hobby shop.

DOC

At 03:18 PM 2/12/2008 -0800, you wrote:

>go to a cheap prototyper.
><http://wickedresin.com/shop/pc/viewcontent.asp?idpage=5>http://wickedresin.com/shop/pc/viewcontent.asp?idpage=5
>
>get a good low price on your prototype.
>and then make the molds yourself for it.
>
>On Feb 12, 2008 10:31 AM, iwillinvent
><<mailto:amy%40nwcomputer.com>amy@nwcomputer.com> wrote:
>
> > Hello. I am designing my first product. For part of this prototype, I
> > need an 1/8-
> > inch inner diameter tubular piece. The wall of the tube is not thick,
> > maybe 1/16- or 1/8-
> > inch. This piece is going over the side pieces of some eyeglasses frames,
> > so I need it to
> > stretch to fit, or I may slit it down the middle to make it easier to put
> > on.
> >
> > I know this piece can be molded, but I am concerned about the expense. Is
> > there a less expensive way to do this for a prototype piece?
> >
> > Any information about creating this piece will be appreciated.
> >
> > Regards,
> >
> > Amy
> >
> >
> >
>
>[Non-text portions of this message have been removed]
>
>

Buy my junk! http://www3.sympatico.ca/doc/robotone/for-sale.html

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Messages in this topic (5)
2e.

Re: Small prototype piece help please

Posted by: "Mike Brose" Mike@puppetsandprops.com   puppetsnprops

Wed Feb 13, 2008 6:24 am (PST)

The silicone fuel tubing could be pretty close. It's light blue in color
and usually available at any good hobby shop that carries RC models,
etc. There are a couple of diameters available. It might be stretchy
enough. Generally you can buy as little or as much as you need. They cut
it off of a roll. Pretty inexpensive for small amounts.

Cheers,

Mike Brose
http://www.puppetsandprops.com

DOC wrote:
> Or just use some bits of rubber tubing available from your
> local hobby shop.
>
> DOC
>
>
> At 03:18 PM 2/12/2008 -0800, you wrote:
>
>
>> go to a cheap prototyper.
>> <http://wickedresin.com/shop/pc/viewcontent.asp?idpage=5>http://wickedresin.com/shop/pc/viewcontent.asp?idpage=5
>>
>> get a good low price on your prototype.
>> and then make the molds yourself for it.
>>
>> On Feb 12, 2008 10:31 AM, iwillinvent
>> <<mailto:amy%40nwcomputer.com>amy@nwcomputer.com> wrote:
>>
>>
>
>
>

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Messages in this topic (5)
3a.

Roto-caster

Posted by: "Mike Calvert" mike.calvert@btinternet.com   mike750786

Tue Feb 12, 2008 6:32 pm (PST)

I suggest you look for parts from Washing Machines and Spin Driers. Their
functions are similar to your needs.
Mike Calvert

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Messages in this topic (2)
3b.

Re: Roto-caster

Posted by: "DOC" doc@sympatico.ca   torobots

Wed Feb 13, 2008 6:34 am (PST)

I'm not sure that this would work with the present design.

But as I mentioned in another post, might be a useful base for
something more muscular.

And there's the SO hazard that needs to be negotiated.

Thanks for the idea.

DOC

At 10:20 AM 2/13/2008 +0800, you wrote:

>I suggest you look for parts from Washing Machines and Spin Driers. Their
>functions are similar to your needs.
>Mike Calvert
>
>

Buy my junk! http://www3.sympatico.ca/doc/robotone/for-sale.html

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Messages in this topic (2)
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