GT&D

[Metric]

Hello all,

This may be an LOL question but please give me some help. I got confused how to read this drawing. Is this .0035" perpendicular with datum A on the 2 of .375/.3785 diameter holes?

Thanks.

Metric.

GT&D.xls

[Del.]

I believe it is True Position

[Del.]

Holes must lie within .050 of the specified tolerance zone of the datums

Hole to hole they must lie within .0035 tolerance zone to each other

 

https://www.tec-ease.com/gdt-tips-view.php?q=119

[Metric]

Hello Del.,

Thank you a lots.

I got it now.

Best regards.

Metric.

 

[crazy^millman]

2 hours ago, Metric said:

Hello all,

This may be an LOL question but please give me some help. I got confused how to read this drawing. Is this .0035" perpendicular with datum A on the 2 of .375/.3785 diameter holes?

Thanks.

Metric.

GT&D.xls

Yes that can be looked at as perpendicular and that looks like Standard dims not Metric as they call out a Standard drill size on the other hole. I cannot see them requiring you to hold 3.5 microns. The " means inch not metric also.

[Mark VIII]

Maybe you were just confused because the print was not in Metric.

 

[jlw™]

Metric is better.

 

IBTL

[crazy^millman]

I am sorry I really didn't pay attention to the user name was Metric and the person posting the question was signing the name and the user name being used was Metric. I will leave my response so someone can get a chuckle out of it.

[Metric]

Hello All,

Thank you for the help. I also though about perpendicular because drill holes go through 2 sides of tube. Look like customer wants the drill not walk from top & bottom.

Again thank you a lot.

Metric.

P.S Ron don't worry about the "Metric" thing. I'm not seeing any problem on that... 

[crazy^millman]

23 minutes ago, Metric said:

Hello All,

Thank you for the help. I also though about perpendicular because drill holes go through 2 sides of tube. Look like customer wants the drill not walk from top & bottom.

Again thank you a lot.

Metric.

P.S Ron don't worry about the "Metric" thing. I'm not seeing any problem on that... 

Yes that is where I will pre drill undersize by normally .03" on that size of a hole then line bore with an under size endmill then come back and ream. Your process is your key here. I have had luck with double and triple margin drills, but don;t do like one customer who cheaped out and got no margin drills then wondered why the holes were floating all of the place. Had to add a milling operation to create a good start hole then we were able to chase with the no margin drills.