Many shops have cylinder squares. How do you know if your cylinder square is accurate? See how we check and repair them in this episode. Visit our webstore www.subtool.com
I really want to make a cylinder square but the guys wont let me in the toolroom because it's too "expensive", I would be doing a 60mm X 200mm mild steel with a 2/3mm thick case hardening :(
It will if more people take a chance on switching over. Imperial units are already based on metric units so it's really up to us to make the switch on our own.
I was told that if you mount a cylinder in a chuck, like a lathe, and grind the end face of it while turning it, making sure the face is ground slightly concave rather than convex, that you are guaranteed a square end to the cylinder. It seems to me that would only be true if the cylinder was being turned with zero radial runout and perfectly concentric with the spindle axis along its length. Comment? Description (or video!) of how cylindrical squares are manufactured?
+Bob Korves The part would only be as square as the squareness of the carriage to the cross slide. From a machinist or toolmakers view, the part would be perfectly square. From a metrologists point of view, it would be roughed in. Any tool room lathe can machine a cylinder that is square to under a thou, but this cylinder would not be adequate to set up a machine this precisely. You should always measure with a tool that is about 10 times more precise than the tolerance in your measurement. IE, use a 10th's mic to measure to a thou. Since we want a precision square to be square to under a 10th, we need to measure and machine to the 10milllionth. You can't realistically machine to this tolerance, and you will lose that much material on the grinding stone during the process if you grind.
On a 4" diameter 12"long cylinder that is off 50 millionths per side, one would remove 50x(12/4) or 16.67 millionths of an inch. Don't sneeze, you'll remove too much.😉
many tks for the great explanation, I made mine and tuned it down to within 3/1000mm square using your advise.
Thanks
Excellent tutorial and with a smile!!:):)
Thank you for that great video
I really want to make a cylinder square but the guys wont let me in the toolroom because it's too "expensive", I would be doing a 60mm X 200mm mild steel with a 2/3mm thick case hardening :(
Love this guy
Many thanks for this explonation. I was wondering for a while how to do it. I wish to live in US, I would buy your products like a hell.
Thank you!
So you would press harder on the high spot so it removes more material ?
first time herring of a cylinder squares what are they used for I am a hobby machinist learning some thing new everyday
thank you
Richard Westerfield
They're used for calibrating squareness checking equipment used for checking finished parts. Not really needed in the home shop.
u can square up a mill head to within 3 thou or better if ur good
njo need for tramming the head
What kind of micrometer is that on your right? It looks super accurate
Bri Vol That is a comparator square like this www.subtool.com/tp/9146_taft-peirce_comparator_square.html
Love these videos, will the USA ever go metric?!
Who knows, not my call! I'm glad you enjoy our videos, thanks for the message and thanks again for watching
It will if more people take a chance on switching over. Imperial units are already based on metric units so it's really up to us to make the switch on our own.
What makes better cylinder square material? Cast iron or hardened steel?
bcbloc02 Steel
I was told that if you mount a cylinder in a chuck, like a lathe, and grind the end face of it while turning it, making sure the face is ground slightly concave rather than convex, that you are guaranteed a square end to the cylinder. It seems to me that would only be true if the cylinder was being turned with zero radial runout and perfectly concentric with the spindle axis along its length. Comment? Description (or video!) of how cylindrical squares are manufactured?
***** We will have a follow up to this with another great tip and a discussion on how to build a cylinder square in the next week or two. Stay tuned!
+Bob Korves The part would only be as square as the squareness of the carriage to the cross slide.
From a machinist or toolmakers view, the part would be perfectly square. From a metrologists point of view, it would be roughed in.
Any tool room lathe can machine a cylinder that is square to under a thou, but this cylinder would not be adequate to set up a machine this precisely.
You should always measure with a tool that is about 10 times more precise than the tolerance in your measurement. IE, use a 10th's mic to measure to a thou. Since we want a precision square to be square to under a 10th, we need to measure and machine to the 10milllionth. You can't realistically machine to this tolerance, and you will lose that much material on the grinding stone during the process if you grind.
On a 4" diameter 12"long cylinder that is off 50 millionths per side, one would remove 50x(12/4) or 16.67 millionths of an inch. Don't sneeze, you'll remove too much.😉
John Bazaar Exactly
s
Did he just say "a millionth?"
Yes, yes he did, 50 millionths is .00005 of an inch
I made it by myself thanks to woodprix plans. I think it's the best way to learn how to build.