Re: [CAD_CAM_EDM_DRO] Re: Digitizers, Renishaw

>That's just the kind of information we're looking for! And it doesn't
>sound too hard to make! It would be useful to get a better idea what
>the "star" looks like, but I just drew the balls and star up in Vector,
>and with a few tries, we should be able to get a star that works (good
>contact angles). Pictures would help! Do you have any? Also, do you
>have a URL for CNCDIGIT?
>
>Thanks for the contribution!
>
>Alan KM6VV
>
>
>
>PMeinhard@... wrote:
>>
>> Hi
>> I�m digitizing on a little stepper-driven mill using a Renishaw. (got a
>> broken one from the company I worke for and repaird it). The innerparts a
>> quite simple and there ist no need for high accuracy . So I think it�s no

>> thing to built one. Basic thing: The Probing Arm has to be able to move

>> every direction to avoid breaking . They manage it that way: 6 little
>> Steel-ball (4mm) are fixed in a circle of 30mm diameter. always two with

>> of 2mm between them , half buried in electric isolating material. on

>> lies a 3-arm-Star of 4mm matrial making an electrical connection while it

>> pressed with a soft spring on them . This is now forming an electrical
>> circuit . Lifting an arm of the star would break the circuit. In the

>> of the star ist an arm leading straight down through a much bigger hole

>> the center of the isolating material ,60mm long with a little ball on

>> end. The star is always centering itself, drawing the ball in each

>> makes one star-arm lift off the balls and breaking the circuit. And that
>> simple thing costs about 1000$- but the idea is great.
>> The accuracy is about 0.005 mm.
>> ( the dimensions are as kept them in my mind and might vary a little)
>> The Software I use is simple but good, CNCDIGIT. cost about 150$( as far

>> remember) remeber
>> Regards
>> Peter
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