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 | AC5ZO
Join Date: Jul 2003 Posts: 928 Rio Rancho, NM 87144 
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2003-09-17 64140
Does anyone on the board know the dimensional specifications of a CAT 1 3 PH? I have some 3PH items that I want to build and I was wondering if the basic dimensions were available somewhere.
Top links seem to be pretty standardized and so I assume that the lower arms are also of a fairly standard length.
I have measures some implements and they vary. Some are designed to lift and maintain level orientation and others are designed to tilt as they lift.
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 | DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada 
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2003-09-17 64179
This is the only thing I can find at the moment. Click on tech info. ....
Link:
Click Here
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 | TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley
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2003-09-18 64223
I guess the interest is knowing before hand if a design will produce an implement that won't change its level during lifts.
The geometry does get complicated. I remember a similar discussion where Roger Loving said he resorted to building a scale model from cardboard strips that he stuck onto paper with pins at the pivot points so he could see how things actually would move. I imagine that basic CAD software would do that particular job as well.
I started drawing triangles of the problem but realized that it would take me some time to solve it by my un-automated trig. I'll hang in here if that's the interest, but I think there are people more current and experienced on the subject than I am. I think there is a CAT I standard but I also think that minor variations are fairly common except for the pin sizes. My impression is that a 3ph would be designed to produce constant level lifts, so those dimensions could be taken as givens. I suspect that a main dimension that would affect the level is whether the top-link mount on the implement is ahead, behind or in the same plane as the lower link mounts.
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| AC5ZO
Join Date: Jul 2003 Posts: 928 Rio Rancho, NM 87144
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2003-09-18 64229
Tom, I do linkage designs all the time to do these kinds of movements with our special robotics applications and machines at my work. But, when I am designing a linkage from scratch, I know all of the link lengths and their pivot points in relation to one another. If you want a straight lift, you simply use a parallelogram linkage. If you shorten the top link, then the system will lift the rear more than the front. You can make more complicated movements by also involving the distance between the lower and upper attachment points on the implement.
What I was wondering is if the pivot points for the lower arms, lower arm lengths and the position of the top link mount in relation to those lower pivots was a standard set of dimensions or if it varies widely. I figured that since there was Cat 0, Cat 1, and so forth that there was a standard that the manufacturers use. This would also be necessary to have interchangability of implements from brand to brand.
Mark, I will check out the link later today. ....
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 | Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York
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2003-09-18 64232
Mark it's been a while since I've been there,it was good to see it agian. When going from one manufacturer to another and depending on job and which type of draft sencing if so equipped they may want different locations yet. I see they had nothing on Cat 2 and larger and that is good because some if not most of those other than maybe Massy would all be lower link. ....
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| AC5ZO
Join Date: Jul 2003 Posts: 928 Rio Rancho, NM 87144
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2003-09-18 64242
Mark, that link is a good start for me.
If there is not a standard set of pivot and link mounting locations on tractors, I will probably just measure my tractor. That is an awful lot of work because of all the things that are in the way, but I could do it. ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley
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2003-09-18 64244
AC: From your posts in general I figured I was addressing too basic a question but maybe it's of interest to others.
From time to time there are discussions about different length lower arms so there'd be some variation; but great similarity I think. I noticed on Mark's site that height is a spec. A good question is how standard are heights on 3ph's and on implements as well. I think that the heights determine if it's a parallelogram configuration. Maybe we'll all do some looking.
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