Re: Positional tolerance question

"PrecisionMachinisT" <precisionmachinist@xxxxxxxxxxx> wrote in
news:9ZSdnRrTorFJZHLfRVn-2g@xxxxxxxxxxxxxxx:

>
> "DJ Bjorklund" <daleb@xxxxxxxxxx> wrote in message
> news:60fve1dlnp6ld589g3pcsdv851phjd2vif@xxxxxxxxxx
>> On Tue, 02 Aug 2005 10:45:09 -0700, Garlicdude <pulsar@xxxxxxxxxx>
>> wrote:
>>
>> >DJ Bjorklund wrote:
>> >>
>> >> Not looking for a doctorial thesis on mechanical tolerancing, just
>> >> an opinion. We're machining fairly low-tolerance mechanical
>> >> parts. A machinist disciplined for not checking holes ultimately
>> >> discovered to be off the center-line ~.025 makes the somewhat weak
>> >> point that there was "...no dimension, so what's the tolerance?!"
>> >>
>> >> Cylindrical part
>> >> Cross hole (pictorially on CL) 1.000" from end
>> >>
>> >> In your typical "three place means +/-.005" situation is location
>> >> tolerance about the CL a function of the OD, .875 in this case,
>> >> thus +/-.005,...or even perhaps +/-.0025 ?
>> >>
>> >> E-mail is fine, thanks
>> >
>> >
>> >
>> >Are you or your machinist intermingling MMC, Maximum Material
>> >Condition , and RFS, Regardless of Feature Size, which are used with
>> >a True Position callout and Ordinate Dimensioning??
>> >
>> >MMC and RFS don't apply in ordinate type dimensioning.
>>
>>
>> No I don't believe he is. He's just making a weak case against the
>> disciplinary action.
>
> Idiot.......
>
> The weak case lies lies entirely in your incomplete drawing, bogus
> engineering and ineffectual management.
>
> Taken to the next level of absurdity you would have him needlessly
> holding +/- .0001 on the same "fairly low-tolerance mechanical parts"
>
> HEY....I GOT A REALLY BRIGHT IDEA....I'll just have all the workers
> "guess" as to the required tolerances, and if they happen to guess
> wrong then I'll discipline them........

Sam,

Do you check yer work after you made yer whole run or perhaps after the
first piece and say every 10% of total run or so in between? Or do you
check each piece? Or do you check nothing? :)

That to me is the issue here, not a missing tolerance.

Bing
.

Relevant Pages

  • Re: Positional tolerance question
    ... >>>Are you or your machinist intermingling MMC, ... >>>MMC and RFS don't apply in ordinate type dimensioning. ... >engineering and ineffectual management. ... Engineer: I'll put +- .001 on the print, ...
    (alt.machines.cnc)
  • Re: Positional tolerance question
    ... >Are you or your machinist intermingling MMC, ... >MMC and RFS don't apply in ordinate type dimensioning. ...
    (alt.machines.cnc)