Chamfer Gages

How accurately do you need to measure the countersink? We only need to measure fairly small countersinks but we use a magnifying loupe with a graduated scale. These will resolve 0.1mm but you can interpolate 0.05mm. You could measure a countersink with this then set your gauge to match.

Thanks for the response. The size range of what we normally measure with the gage is between .120 and .240. Our customer requires +/-.005 on the size and we must take into account that the surface wil get timesaved after machining. Would be very interested in learning more about the method that you described.

Thanks

Tim

Could you have sets of functional go/not go gages made for the sizes in question?

What do you mean "that the surface wil get timesaved after machining?"

milo

The manufacturer of the gage should be able to supply you with standards to verify the gage while it is in use. Wear on the end of the tool shouldn't be a big factor as this part of the tool is not generally contacting the work. However, if you need a tool to verify your gage while in use, you can use a ring gage that has been surface ground to remove any chamfer. The chamfer gage should read the diameter of the ring. If not you need to send your chamfer gage for repiar/rebuild.

Thanks for the replys. We use a timesaver for finish purposes. Basically our parts are flat aluminum .25 x .75 x 9.25 and the timesaver uses a conveyor belt that moves horizontally and while part is in motion there is a sanding belt being spun vertically and it surfaces the top of the part. Almost like a surface grinder but the part itself moves, usually in a multi part fixture. I have used pin gages to optically compare against what the chamfer gage reads. This method is ok, but for the average person on the floor running the parts its not always a viable process. The way that the manufacturer sets the gage is that you push the tool all the way down and while bottomed out the gage should read approx .010 for the diameter. I agree with you as far as the tip of the tool has no bearing on the size of the chamfer. This is why I would like to have a static style gage. The ring gage idea definitely sounds like a good one.

Find a chamfer gage with carbide tips they will last alot longer.