Recent content by ewans

Thanks to all for the replies... appreciated. JNieman, Thanks... however, what I was looking for was functionality that sends an email notification when a new thread is posted to the forum, not when a new reply is posted to a thread. Cheers, Ewan

Hi all, Apologies for this general forum question... I've searched the FAQs and elsewhere on Eng-Tips and can't find any information. Does the "subscribe to forum" functionality, accessed from the top RH corner "Forums" tab --> "Subscribe to Forums" not work? I've tried it multiple times...

Hi 3DDave, Are you referring to the shoulder on the datum feature A bearing journal, or on the datum feature B bearing bore? For the datum A journal, if the shoulder is not perpendicular to the axis it may result in a gap, but more likely it will result in a very unhappy cross-roller ring. I...

Hi pylfrm Thanks for your input to this discussion... appreciated. I did have concerns about the short length of datum feature A relative to the overall size of the part. It is, however, the most functionally significant feature on the part. Cheers, Ewan

Morning drawoh, Thanks for your reply... appreciated. Ewan

Hi Mod, If you opted to use runout at discrete cross-sections (vs. over a partial length), I would say that your proposal to use a chain line normal to the axis, located with basic dims, is a good approach, albeit perhaps not completely compliant with Y14.5-2009. For clarity, I would add a note...

Hi ModulusCT, As you may be aware, per Y14.5-2009, it is acceptable to apply a runout tolerance to a only a portion of a surface. This is designated using a chain line adjacent to the surface, dimensioned using basic dimensions. Cheers, Ewan

Hi drawoh, My sense is (and I am quite possibly incorrect) that the datum feature B does not require much length to constrain the rotation of datum axis A. Would the datum feature simulator for datum B not simply be required to expand until it makes contact with datum feature B as the part is...

Hi drawoh, Thanks for your reply... appreciated. Agreed... a hard fixture to establish Datum B at RFS (or RMB as I gather it's now called) would be challenging. Fortunately, the supplier has a CMM ;) I had considered using |A|B-C| as the datum reference frame, but every example I found of using...

Morning all, Hoping for some input/feedback on whether or not an orthogonal datum axis feature can be used to constrain the rotation of a primary datum axis. I can't find an example of this scenario in Y14.5-2009 or in any other online resources. The closest reference I could find was section...

Morning all, Many thanks for your replies... much appreciated. Regards, Ewan

Hi byrdj and tr1ntx, Thanks to both for your replies... appreciated. Unfortunately, I'm pretty sure with the switch and target placement you proposed the following occurs: - when going CW, you get a/A and b/B at 180°, not 200° - when going CCW, you get b/B and a/A at -180°, not -200° Do you...

Hi MintJulep, From a center home position, the turntable travels 200° CW or 200° CCW, for a total travel range of 400° end-to-end. When the turntable hits either the CW or CCW end limit, it needs to stop. Regards, Ewan

Hi IRstuff, Thanks for your follow-up, and for confirming that the direction of rotation needs to be evaluated, either by hardware or software... this is the conclusion I had come to (albeit reluctantly). Ideally, I would like to avoid a software solution, and can envision mechanical levers or...

Thanks to all for the replies so far... much appreciated. quark, My goal is to have the proximity switches fixed to the moving turntable with stationary targets. This is the configuration I've been trying to make work, so far unsuccessfully. IRstuff, I don't think I can get away with a single...