2011年3月3日 · Cylindricity is a bilateral, parallel tolerance zone around the feature of size you are measuring. The surface must fall within the extents of that tolerance zone. Using total indicator movement / total runout would suffice, but depending on the geometry of your part, you could possibly reject good parts.

2016年11月29日 · In fact, on the right hand side, we don't know what the feature size limits are. Using circularity call out allows requiring a relatively tight roundness tolerance, and a relatively loose size tolerance. In the drawing on the right hand side, the size limits of the 75 mm dimension isn't actually shown. It could be 75 +/- 3 mm, circularity 0.1.

2017年4月13日 · This controls location, orientation, and circularity. Note that concentricity does not control circularity but runout does. Total indicated runout is just runout applied along an axis. The tolerance zone is a hollow cylinder with perfect form in the center (think pipe). This controls location, orientation, and cylindricity.

2012年6月19日 · "I am dealing with some large diamter aluminum tubing and I am most concerned with the circularity (cylindricity) of the ID;" What I'd do with the pipe you have is measure the OD at several places and measure wall thickness too at several places. If nothing else that'll give how round the pipe is and how much the wall thickness varies.

2010年5月19日 · My understanding is that circularity is the quality of every part on a circle to be equidistant to the center point. Therefore to measure roundness you would take Diameter readings at however many parts, and the Difference between the lowest and highest Diameter would be your circularity. we don't have anyway to spin this part right now ...

2014年5月15日 · Maybe a bit more than 6 hours involved. I would breifly cover theCharacteristics, ie True Position, Profile, Flatness etc. Then Feature control frames. Also, if the Characteristics need datums or not. What a tolerance in True Position or other characteristics mean vs linear etc. I'd also show the cost savings of True Position vs Linear ...

2017年3月5日 · Most of the top drawer lathes can cut your part sizes to 1 micron to 0.4 micron circularity on one part of the cylinder (for the range of sizes you are talking about). However total part accuracy / "cylindricity" will be of the order of 6 micron when cut on a really high end machine (such as Hardinge Super-precision lathe) in a material that is ...

2016年5月9日 · Cylindricity would apply to the entire length of a bore/shaft and circularity would apply to a cross-section at a designated plane. I think the general rule of thumb is that if your diameter is much larger than your length, circularity will do (thin parts with big diameters).

2009年8月5日 · How do I go about checking Cylindricity of a part if I do not have a CMM? Parts are as follow: Material - Nuclear Grade Graphite OD - 4.200" ID - 2.378" +-.001" with a Cylindricity tolerance of +-.001 Length - 10.620" Thanks for your input.

2014年10月16日 · we had a bearign with a +0.001/-0 and a cylindricity of like 0.0003 you can definitely be in tolerance and out of circularity, I dealt with a vendor who did this, and we quit using them because they could not make circles only ovals and other strange bumpy surfaces.