gage screw correct name & where to find
gage screw correct name & where to find
(OP)
I don't really have any inspection experience being on the design side but am helping a manufacturing intern design a crude go-gauge for a granite part with a number of threaded inserts. We want to check the position of inserts is OK.
http://www.tec-ease.com/tips/june-03.htm shows something like what we'll be creating at bottom right, though ours will have 12 or more holes to check.
What is the correct name for the gage screws used in the link. They don't have to be exactly like that, any variation that will work is fine. I tried some google searches and couldn't find quite the right thing. I may resort to shoulder screws as the +0 -.001" on the shank might be OK but I'd prefer to use proper gage screws which should have slightly better tolerances and better coaxiality etc.
Thanks
http://www.tec-ease.com/tips/june-03.htm shows something like what we'll be creating at bottom right, though ours will have 12 or more holes to check.
What is the correct name for the gage screws used in the link. They don't have to be exactly like that, any variation that will work is fine. I tried some google searches and couldn't find quite the right thing. I may resort to shoulder screws as the +0 -.001" on the shank might be OK but I'd prefer to use proper gage screws which should have slightly better tolerances and better coaxiality etc.
Thanks
KENAT,
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RE: gage screw correct name & where to find
Are you perhaps thinking of True Position Locators? A link to a potential source is below.
http://www.lavezzi.com/QA/LavTruPos.html
Regards,
RE: gage screw correct name & where to find
We're looking at an actual go gauge as the part to be checked is part of a vendor supplied assembly.
KENAT,
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RE: gage screw correct name & where to find
http:/
Johnson Gage is another respected provider of these gages:
http://www.johnsongage.com
Regards,
Cory
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RE: gage screw correct name & where to find
Example: http://www
RE: gage screw correct name & where to find
I already suggested picking up on the minor dia with pins as it would be a lot quicker but I'm not sure that will be adequate.
I just found out that this whole thing is a complete mess, we aren't even sure what locational/position tolerance we're trying to verify!
KENAT,
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RE: gage screw correct name & where to find
RE: gage screw correct name & where to find
I'm looking for something you put up against the face, put 'gauge screws' in all the holes and if you are able to do this then you're good to go.
KENAT,
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RE: gage screw correct name & where to find
RE: gage screw correct name & where to find
So screw a gizmo into each hole and try to set a gage plate over them all. Doesn't that have the same result?
ht
The TPLs suggested by PSE above would seem to allow the same.
RE: gage screw correct name & where to find
They were also a bit expensive considering I'll need a bunch of them. $85 or so a pop for around 20 to make a gauge for a product that isn't selling well in this economic climate may not be viable.
KENAT,
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RE: gage screw correct name & where to find
On a slightly more serious note why would shoulder screws not work, would the .001" limit really matter? If so you could cylindrically grind them to a certain size, you can also buy them with different thread specs at a cost.
RE: gage screw correct name & where to find
Having got definitive tolerance information on the part being inspected I think I can get away with using 'precision' shoulder screws. I'm a bit concerned about the coaxiality of the screw thread to the shank but it'll probably be OK. Turned out the tolerance was looser than I'd initially been led to believe so I have a bigger tol budget and can accomodate the .001.
Sounds like concensus is that the screws often shown in illustrations like that in my link are usually custom.
Thanks all.
KENAT,
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RE: gage screw correct name & where to find
Ajack,
How do you grind something larger?
RE: gage screw correct name & where to find
Kenat
KENAT,
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RE: gage screw correct name & where to find
I was actually thinking of grinding it smaller by say .005" and then making the gauge to suit, surely it is the relationship between the body of the shoulder screw and the hole in the gauge that matters not the actual sizes?
RE: gage screw correct name & where to find
Regards,
Cory
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RE: gage screw correct name & where to find
Basically some kind of precision shoulder screw is pretty much what I need, ideally with a head like a thumbscrew to ease use (captive would be nice too but typicall captive techniques wouldn't work well for this appliation).
The self centering thread on some of the 'hole location gauges' would be nice to overcome the concerns of truely centering on the thread but the 'head' & shank geometry of these do not meet my needs.
As to the other thread gauges that typically appear to be a hex with threads on either end, these also do not meet my needs.
I also have concerns over using off the shelf shoulder screws as I'm not sure of the thread form & coaxiality of thread to shank. However, having found a bit more information on how this gauge is to be used they'll probably be adequate.
ajack, that's what I'd thought of doing with the shoulder screws, turning them down to get a tighter tolerance, if I was going to do that though I'd also want to closer control coaxiality to the thread and I'm not sure how practical that is at the tolerances I'm looking at and the likely budget.
KENAT,
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