2012年5月10日 · A cylindrical square provides a true vertical surface (within specs) when placed on one end, which is very handy. It provides an accurately calibrated tilted surface when placed on the other end, which also is very handy since it allows you to quantitatively determine how far tilted from vertical a test surface is.

2005年3月26日 · I actually made one last night before I posted this thread.... I recently had an opportunity to examine a locally made 6" cylindrical square that checked out square greater then our measuring gear could detect (0.002mm Tesa dial indicator) It was hardened steel ground to a mirror finish...And it cost the owner a bit over $100 at auction..

2012年12月26日 · I have a Brown & Sharpe 558 cylindrical square, which is the perfect implement for "calibrating" the vertical travel on my Talyrond roundness tester. Thanks to the B&S 558 I know the ways on the vertical transport mechanism are perpendicular to the face of the rotating table to better than 0.0001" / 5".

2018年8月27日 · The Brown & Sharpe 558 Cylindrical has one end laped at a very slight angle. You can turn it when it's resting against the work and measure the amount that the part is out of square in .0001 increments. Brown & Sharpe was the only company to make a …

2022年7月23日 · Since many today have never heard of or seen a B&S 558 Cylindrical Square. This is what they look like. The more usual cylindrical squares can't do what these can.

2009年4月29日 · Making a cylindrical square isn't quite as easy as David describes. Because the spindle of a lathe can pump in and out swashplate-fashion if the thrust bearing is imperfectly perpendicular to the spindle, facing cuts can be slightly out of truth. To avoid this the final facing cut should be done between centers using "dead" centers.

2015年2月25日 · Brown and Sharpe Model 558 cylindrical master square in the fitted wooden box. This is really nice gage. It was perfect condition when I stored it but got some moisture at some point. There is some light surface rust in a few spots (see pictures). This doesn't effect the operation of the gage. It's about 6.3" long 2.4" diameter.

2010年6月9日 · Hello All- mark from Vermont here. I recently bought a cylindrical square off ebay. i am looking for an interpretation of the markings on this artifact. I received no paperwork with my purchase, pics can be seen cylindrical square pictures by SilentUnicorn - …

2008年12月18日 · I just managed to finally buy after more than a years looking, A late model Brown & Sharpe 558 Cylindrical Square that appears to be in excellent shape. Ebay item 200716241450. I won't have it in my hands for a couple of weeks due to shipping and customs clearance into Canaduh.

2020年3月21日 · Combination Square Anatomy. What makes the combination square special is its composition. The most common combination square is a two-part tool, comprised of the rule and the “standard” or “square” head. The more souped-up combination square is a made up of a steel rule, 45-degree holder, protractor, and center square.