Need Accurate Manual Horizontal Adjustment To Internal Deck inside Frame.

[Zibraz]

I need this middle deck adjustable vertically because of potential tolerance stack up problems. I have been trying to figure out the best elegant solution and this is the "best" solution I have come up with.

A long M4 x 80mm screw goes through a self clinch nut. This screw will push against the bottom base plate which provides the horizontal adjustment. The nut above the middle deck will lock this in place once the appropriate adjustment is found. This will then be fixed into the two side frames either with a screw going through a slot, or chimney nut.

Can anyone give me some different/better methods of accurately adjusting the height of this middle deck?

 

[MintJulep]

need this middle deck adjustable horizontally

Did you mean vertically?

How often? One time when you assemble it? Once a year? Once a day?

 

[Zibraz]

Do you mean vertically

Sorry, yes I did. My bad.

It's assembled once. It won't be taken apart unless a part fails, which is unlikely. It's a one time adjustment during build which shouldn't change.

 

[SnTMan]

Can anyone give me some different/better methods of accurately adjusting the height of this middle deck?

Over what range?

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[Zibraz]

Over what range?

Not a large distance. Probably something like +/- 8mm at absolute max.

 

[SnTMan]

Can you use something like a lab jack to position the deck, fasten it and remove the jack?

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[Zibraz]

Can you use something like a lab jack to position the deck, fasten it and remove the jack?

I was considering looking for some sort of screw jack which can be removed. It was going to be one of the solutions I present to see what my manager prefers.

Something like that would do pretty well I think, their pretty cheap aswel.

 

[Compositepro]

If this is for manufacturing an assembly, you use jigs and fixtures to locate parts and then fix them in place by welding or slotted bolt holes, or any multitude of methods. Your excessively long and slender threaded rods qualify, but are a terrible idea that would maybe be okay if you are only going to make one. You seem to be trying to make a jig as cheaply as possible. The purpose of the jig is to make assembly as cheap as possible because it will be used hundreds or thousands of times.

 

[Zibraz]

If this is for manufacturing an assembly, you use jigs and fixtures to locate parts and then fix them in place by welding or slotted bolt holes, or any multitude of methods. Your excessively long and slender threaded rods qualify, but are a terrible idea that would maybe be okay if you are only going to make one. You seem to be trying to make a jig as cheaply as possible. The purpose of the jig is to make assembly as cheap as possible because it will be used hundreds or thousands of times.

I have designed jigs previously for my other projects but I don't think this lends it's self well to a jig. The way we have to design the top part of the machine means the middle deck highlighted needs to shift up and down.

I was thinking of reducing the size of the screws and having a steel block under the thread to act as the base, but it just seemed to be adding cost where a long screw would work just as well.

Another option I might use is some sort of jack which can be removed once it's been located and fixed into the slotted holes.