Strong opinions that 60 degrees is better. We cannot find any scientific data to support this opinion. So, we go to the lab for a demonstration and show you the results.
We purposely created an out of round condition on a roll from one of our Suburban Tool Sine Plates. We measured it first on one of our TAFT-PEIRCE Bench Centers for a point of reference. We then measured it in a 90 degree V- Block and then a 60 degree V-Block. Take a look at the results. You may be surprised.
https://www.youtube.com/watch?v=YUeFNGslzZo
60 degree or 90 degree V- block, which is better for determi
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Re: 60 degree or 90 degree V- block, which is better for det
Interesting video, while watching it I got to thinking about comments made about grinding with a centerless grinder and how if not done properly you could wind up with a 3 lobed shape instead of round. Which, when measured with a mic., ends up indicating a round condition even though it is not. With an item like I just described if you were to perform the same test, as done in the video, would one v block be better to use for determining a three lobed condition?
In my minds eye when I rotate the shape in each V-block it seems that a 60* V-block does a better job showing this out of round condition. That being said I am not extremely confident in my thoughts on this matter as my brain started hurting when I was rotating in the 90* block!
Does anyone know the answer to my query? Has the ability, and time, to run this test then present their findings? Or hazard an educated guess?
In my minds eye when I rotate the shape in each V-block it seems that a 60* V-block does a better job showing this out of round condition. That being said I am not extremely confident in my thoughts on this matter as my brain started hurting when I was rotating in the 90* block!
Does anyone know the answer to my query? Has the ability, and time, to run this test then present their findings? Or hazard an educated guess?
Re: 60 degree or 90 degree V- block, which is better for det
A 60 degree V block would be better for tri-lobed parts, as you could quantify the error.
It's a bit more complex to quantify a 60 degree error using a 45 degree V block as it will show more humps and valleys (using an indicator) than you actually have.
It's a bit more complex to quantify a 60 degree error using a 45 degree V block as it will show more humps and valleys (using an indicator) than you actually have.
Glenn
Operating machines is perfectly safe......until you forget how dangerous it really is!
Operating machines is perfectly safe......until you forget how dangerous it really is!