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I called a leading UK extruder and was informed this process is not one they are aware of, so my guess is this isn't possible.

I have seen progressive forming of masts then welded, but never seen a tapered extrusion. I have noticed reference to variable geometry dies so was curious if this is actually possible.

Tried searching google but struggled to find any information. I am familiar with the standard aluminium extrusion process for constant section. I am wondering if there is a possibility to extrude a section lets say circular starting at 100mm diameter reducing to 75mm over an 8m length...

Hello All, Relatively new to Creo so could be a basic question for some. I would like to construct a sketch driven point pattern to achieve the following in the drawing: I can achieve the above with two separate pattern features but not with the desired sketch driven point pattern. With a...

Thank you for the information 3DDave, that is actually very helpful, as this gives some standard reference to the issue I have encountered.

The question was really trying to establish whether a circularity tolerance is required in conjunction with a +0.021 fit. Personally I do not believe it is. I was interested in others opinions that all.

The manufacturer specifies the tolerance for the bearing, its not something I've made up. Shaft and hole fits are specified under ISO 286.

Sorry Guys, My question really is that surely the 0.021 tolerance constrains the boundary conditions of circularity, as worse case scenario would be a circularity of 0.02 to maintain this diameter size. This was my point why would you need to specify both. I am sceptical any tighter tolerance...

My understanding that on a hole basis if a 0.021 tolerance is stated this is the maximum value of the runout.....so the GD&T circularity would theoretically apply to a dimension of 20.01 with a +/-0.01 circularity tolerance to meet the ISO 286 fit diameter specified of 20 -0 +0.021.

Thank you for the reply, this was also my understanding and the reason I dimensioned this way and didn't add the circularity tolerance, I was just trying to get some other opinions. Although I was keen to know how others deal with a 'press fit' situation under ISO 286 values. As these values...

Yes this is correct so unless otherwise specified the general tolerance applies....in this case mK My real main point was.....unless I specify a very tight 0.01 or less circularity tolerance it would have no effect on the 0.021 margin on diameter.

ISO 2768

Hello All, New to the forum and would just like some other opinion on this subject. I have specified a hole tolerance to accept a bearing, which is a 20.0 H7 +0 / +0.021 the centre position is defined by GD&T position and datum references, the hole depth is around 20mm. The selected...