Re: [CAD_CAM_EDM_DRO] Linear Slide Components

I believe, if one were determined, he (she?) could make a very decent
CNC-ready router or plasma cutting table with just a good drill press, and
a bandsaw, (okay, throw in a good welder, too) using as many
'off-the-shelf' items as possible from McMaster-Carr, MSC, KBC, SPI, and
the likes. Oh, and a good deal of ingenuity! Just how accurate do you need
to be? With a 3ft x 4ft table, if you could measure to within 1/16" at the
3 ft length, you would still be within 3 minutes of arc, of being
"square"... a 1/32" error would put you within 1.5 minutes! (The 4ft & 5 ft
legs would yield even smaller errors, hence the 3ft choice).

RayHex
----------

> From: Lee Wenger <wenger2k@...>

> First of all my interest is predominantly for a CNC router as
> opposed to a mill and or plasma cutter. Although I think my questions

would

> certainly apply to the creation of a plasma table.
>
> One of the major elements is obviously the linear slide components and to

be

> perfectly honest I don't understand why the need (in other words, the
> quantifiable difference) to use commercial quality components that

increase

> the cost so dramatically. People regularly bash any use of anything

other

> than commercial grade linear slide components? Why, why is it that a
> V-wheel on angle iron or skateboard wheels against a hard flat edge is

such

> a horrible idea? From what I've seen, as soon as you use any

commercially

> available linear components the cost of those components alone is well in
> excess of $1000 for a 4x8. Of course there is the eBay option but
> personally, ideally, I'd like to do something that is reproducible as
> opposed to a total science project.
>
> I'm not being defensive but rather truly trying to determine the

difference

> between these approaches.
>
> Another question I have is how does one go about squaring a large table.

I

> certainly know how to do traditional construction type of squaring and

what

> a 3-4-5 triangle is and all that but how on earth do you measure these
> things to sufficient accuracy on such a large scale. I'm assuming my
> framing square will be completely useless as it would only be suitable

for

> initial setting but I would need a far more accurate way to finalize my
> squaring.
>
> Last question, I don't own a mill and will need to make some parts for my
> machine. Do you all have suggestions as to lower cost ways to produce

some

> of the machined parts I need made outside of the traditional commercial
> machine shop?
>
> Thanks in advance for all of your help.
>
> Lee Wenger
>
>
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