topic Re: Advice recording a Rotation/Translation constraint in Inventor Forum

Advice recording a Rotation/Translation constraint

Vagulus — Fri, 08 Dec 2017 02:36:23 GMT

I have a device involving a screw and a nut. My idea is that I should be able to turn the screw (not animating the turning - just manual) and have the screw move to and fro in the nut. I have tried and it doesn't work (see video).

All the YouTube stuff I can find involves animating the turning of the screw. My faithful text doesn't mention this at all.

Let's be clear. All I want to do is set the cursor on the end of the silver handle and turn the screw. The screw should then move in and out along the axiz of the nut.

All assistance appreciated.

Re: Advice recording a Rotation/Translation constraint

Xun.Zhang — Fri, 08 Dec 2017 04:33:19 GMT

Hi,

Have you tried it in presentation environment, it should be work with tweak command for both movements and rotations in the timeline.

Thanks!

Re: Advice recording a Rotation/Translation constraint

JDMather — Fri, 08 Dec 2017 15:09:57 GMT

This can be done with a Rotational/Translation constraint, but I would probably have to go through and rebuild your assembly to my specs from beginning to end.

For example, your OB-001-000 assembly does not have any grounded components.

Usually, but not always, every assembly (including sub-assemblies) has at least one grounded component.

If it doesn't, it usually has at least one component mated in such a way that the only remaining DOF is a rotational DOF.

I will try to get back to this later, but very busy this weekend.

Re: Advice recording a Rotation/Translation constraint

Vagulus — Sat, 09 Dec 2017 02:45:42 GMT

I have rebuild the General Assembly OB-000-0000 with the Keeper (1) in OB-001-0000 grounded.

Everything else seems okay and I have attached the updated pack-and-go. What I have been unable to do is to establish a constraint such that one rotation of the grey metal handle results in the screw (3) moving 3 mm through the nut (2). I still wind up with the problems I showed in the video attached to the first post in this thread. Linear motion of the screw is constrained to stops in and out.

I have done this trick before and never had any problems. I cannot for the life of me figure out why it does not work this time. If someone can arrange an epiphany in this matter I would be most appreciative.

Thanks

Re: Advice recording a Rotation/Translation constraint

Vagulus — Sat, 09 Dec 2017 03:21:17 GMT

For the record, one of the tutorial resources I have looked at is this video (start viewing at about 3/4-time for the meat of the matter). This is what I have done in the past. Today it does not work. I can move the screw in and out (which I shouldn't be able to do) and I can't turn the handle (which I should be able to do).

Nuts!

Re: Advice recording a Rotation/Translation constraint

Vagulus — Thu, 14 Dec 2017 00:34:37 GMT

I still do not have a solution to my issue with the Rotation/Translation Constraint in the Overbender.

Does that make this issue a little more clear?

Re: Advice recording a Rotation/Translation constraint

jhackney1972 — Thu, 14 Dec 2017 02:27:10 GMT

What you are asking to do is impossible in Inventor. You can never rotate the screw directly that is a part of the rotational-translation constraint. You must drive another constrain to cause the movement which in turn will drive the screw. A work around to this is illustrated in my Screencast. You may not like the fake nut I place in the assembly to do this but you could easily use the boss on top of the unit for the same purpose.

My the way, do not use my assembly to move forward, your pack and go zip file was missing all of the content center parts so I deleted them instead of taking the time to replace them. If you open my assembly, use LevelofDetail2.

Re: Advice recording a Rotation/Translation constraint

Vagulus — Thu, 14 Dec 2017 06:45:03 GMT

Thanks jrh but I have to say that I am a little devastated.

I have done what I was wanting to do here before, but when I look up the archives I find that I did it in Solidworks (Yes, I have walked on the Dark Side.) This means that there is something in 3D modelling you can do in Solidworks that you can't to in Inventor. I have always staunchly avowed that that could not be true.

Please, somebody tell me that this is not so! Strike a blow for the sanity of Drafters everywhere, and show me how to manually operate the screw.

Pretty please (with sugarlumps)!