Re: [CAD_CAM_EDM_DRO] Re: very cheap (read: free) bases for your next gantry project

On Tue, 20 Jan 2004 19:04:28 -0000, you wrote:

>--- In CAD_CAM_EDM_DRO@yahoogroups.com, Harvey White <madyn@i...>
>wrote:
>> On Tue, 20 Jan 2004 16:00:57 -0000, you wrote:
>>
>> >--- In CAD_CAM_EDM_DRO@yahoogroups.com, Gregory Kamysz
>> ><smsupply@a...> wrote:
>> >> I'm looking for a base for my machine now. Have you worked with
>> >the
>> >> material? What do you use to cut it? I don't need anything
>that
>> >big.
>> >>
>> >> Greg Kamysz
>> >
>> >
>> >An alternate thing is to buy a regular surface plate. Some places
>> >have great sales and you can get closer to what you need.
>>
>> An 18 by 24 inch surface plate weighs upwards of 150 pounds. a 12 x
>> 18 surface plate weighs about 75. Unless you get imported, you're
>> also talking about some serious money for the larger ones.
>>
>> Harvey
>
>What is a *surface plate*, foreigner wants to know :)

rectangular block of granite, ground and polished to a good tolerance,
say 0.000 inches or better. Used as a calibration standard for "flat"
in a machine shop. They come in different grades of flatness.

Typically about 3 inches thick at the 12 by 18 inch size.

Harvey

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