Re: [CAD_CAM_EDM_DRO] Renishaw, digitizers

Hi All:
I'd make the slots tapered, so the ball doesn't ride up on the corner of
the slot.
Otherwise, you will end up with dimples bashed into the edges of the slots.

Cheers

Marcus
-----Original Message-----
From: Jon Elson <jmelson@...>
To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
Date: Friday, January 12, 2001 3:47 PM
Subject: Re: [CAD_CAM_EDM_DRO] Renishaw, digitizers

>
>
>Bill Phillips wrote:
>
>> Jon Anderson wrote
>>
>> >3 conical depressions (like a countersink) would work as well, and might
>> >be a lot easier to make and be sure they were on target. In fact, you
>> >don't even need cones! 3 holes with well-chosen diameters so that they
>> >sat part way down on the balls would work quite well.
>> >
>> >Jon
>>
>> If you have 3 holes how do you guarantee that each ball will sit down in
>> exactly the same place each time? It will be much better to just mill

slots

>> rather than a holes. The slot will guarantee two points of contact for

each

>> ball. The six points of contact wil then fix the dangly bit repeatably in

3

>> dimensions.
>
>You, this makes a lot of sense! Maybe the slots should be fairly wide, so
>that the contact points are not right at the top of the ball, but a good

way

>down the sides. The pressure of the small contact points would improve
>the reliability of the contacts.
>
>Jon
>
>
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