Re: [CAD_CAM_EDM_DRO] What is the best way to CAD a flywheel w/spokes?

Hi Ken, Bob,

I have been doing a few flywheels for my Baby Beam Engine. I'm on my
third type, one with turned spokes, one cut out of plate stock, and now
(hopefully) a cast one. I just milled the oak pattern out on the
Sherline. I'd be happy to help as well.

Not sure of the question? In Vector CAD you can draw a radial line,
then cut and paste it 5 times in a 360 degree rotation about the Z axis,
thus giving you the 5 spokes. But if you're going to mill the cutouts
for the spokes, then what you do is draw one spoke, and then replicate
it around. To draw a spoke, you can copy and rotate the center line of
a spoke to either side of the centerline, offset by a small amount.
Then draw a rim, and add fillets in the corners of the pocket between
the spokes to be cut out. These pie shaped cutouts also have a fillet
where the sides meet near the center. This is your basic spoke.

What was the 65 degree offset you're talking about? is that the side of
the spoke, as opposed to the centerline of the spoke? As in above, a
rotation of a line about the Z axis can give you the sides of the
spokes. In my milled flywheels, I rotate the line, then draw an arc
(15" radius for a 5" flywheel) through it's endpoints. This gives the
spoke a "fishbelley", rather then just a straight radial line.

I've just uploaded Flywheel 6B pix (JPG) to the files of SherlineCNC

http://groups.yahoo.com/group/SherlineCNC/files/KM6VV%20Engines/

This drawing was used to mill an oak flywheel pattern for casting in
bronze this weekend (hopefully!). The diameter is 6", The rim is 1/2"
thick, and was machined on a CNC'd Sherline mill (rotary table). The
spokes are about 3/8" thick, and thus are set in from the rim. It is
possibly to "thin" looking for your engine, as it is for an 1850's beam
engine. But you get the idea. Oh yeah, 6 spokes, not 5!

I REALLY like bar stock engines, but I couldn't resist the opportunity
to try a cast flywheel. Flywheels are an interesting place to
experiment with your design. I usually try at least two different
flywheels for each engine model I build!

Alan KM6VV



Robert Campbell wrote:

> Ken,
>
> If you have a picture you can send it directly to me.
>
> I will help you draw it.
>
> Bob Campbell
> Bob@...
> www.campbelldesigns.com
> Breakout board
> THC board sets
> CNC router plans
> Stepper Motors
> VisualMill Basic
> ----- Original Message -----
> From: "mszollar" <kenargo@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Tuesday, June 15, 2004 9:20 PM
> Subject: [CAD_CAM_EDM_DRO] What is the best way to CAD a flywheel w/spokes?
>
>
>
>>I am working on drawing a flywheel with 5 spokes, each 72 degrees
>>apart. The outer rim of the cutout is offset 65 deg. from each
>>spoke. I'm not quite certain where to start and how to go about it.
>>Any help would be appreciated. Hopefully this makes sense but if an
>>image is needed I can
>>upload one.
>>
>>Thanks,
>>Ken
>>
>>
>>
>>Addresses:
>>FAQ: http://www.ktmarketing.com/faq.html
>>FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>>Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>>
>>Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
>>Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
>>List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...,
>
> timg@...
>
>>Moderator: pentam@... indigo_red@... davemucha@...
>
> [Moderators]
>
>>URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>>
>>OFF Topic POSTS: General Machining
>>If you wish to post on unlimited OT subjects goto:
>
> aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
> you have trouble.
>
>>http://www.metalworking.com/news_servers.html
>>
>>http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
>
> sister site to the CCED group, as many of the same members are there, for OT
> subjects, that are not allowed on the CCED list.
>
>>NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
>
> DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
>
>>bill
>>List Mom
>>List Owner
>>
>>
>>Yahoo! Groups Links
>>
>>
>>
>>
>>
>
>
>
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@..., timg@...
> Moderator: pentam@... indigo_red@... davemucha@... [Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
> Yahoo! Groups Links
>
>
>
>
>
>