B
Re: Suggestions for measuring an internal groove for a snap ring?
Hi Discordian,
If you could get an accurate measurement of the ID (using deltronic pins), then lay the part on it's side.
Use a height gage with with an indicator (graduation .00005") find the low spot on the ID, zero the height gage/indicator, and then lower the indicator tip into the ring groove finding the low spot, multiply the difference by 2 and add to the ID diameter.
I checked our indicator tip and the diameter was aprox .039". Since the width of your groove is a reference dimension of .019" it would not hurt to widen this by .001" or so, for the tip to fit in.
I would then use Ederie suggestion of metrology puddy to verify that that the width of the groove is consistant, so I am not hitting a high or low spot, inside the groove, with the indicator tip.
You also mentioned cutting the part for a first article. If the ID is manufactured with the same tool as the groove. Could you not use the first article dimension on the ID dimension (with deltronic pins again) to determine the exact offsets you need to adjust the groove to stay in tolerance? Then you could base your groove ID off of the ID and adjust accordingly to the ID.
Brad
Hi Discordian,
If you could get an accurate measurement of the ID (using deltronic pins), then lay the part on it's side.
Use a height gage with with an indicator (graduation .00005") find the low spot on the ID, zero the height gage/indicator, and then lower the indicator tip into the ring groove finding the low spot, multiply the difference by 2 and add to the ID diameter.
I checked our indicator tip and the diameter was aprox .039". Since the width of your groove is a reference dimension of .019" it would not hurt to widen this by .001" or so, for the tip to fit in.
I would then use Ederie suggestion of metrology puddy to verify that that the width of the groove is consistant, so I am not hitting a high or low spot, inside the groove, with the indicator tip.
You also mentioned cutting the part for a first article. If the ID is manufactured with the same tool as the groove. Could you not use the first article dimension on the ID dimension (with deltronic pins again) to determine the exact offsets you need to adjust the groove to stay in tolerance? Then you could base your groove ID off of the ID and adjust accordingly to the ID.
Brad