Quadriple Reverse 8 Bar lift(QR8B)

The double reverse 4 bar lift, and the quadruple reverse 8 bar lift.

It appears to be that you are referencing vertical height.
Saving vertical height is less useful than saving horizontal space, since you can’t really mount anything on top of the qr8b.
Again, a qr8b is not impossible, but is unnecessary, as a tower built that tall would be very unstable.
Its better off as recruiting material than something to be used in tournaments.

Ahem. I mean qr4b. I have been struck by the big dum

Have you seen any robots which had such a lift? And also because there are 4 axes of movement, there are 8 bars, double the amount on a DR4B

The terminology used in VEX lifts is not consistent with other uses in engineering.
Still, the term 4-bar in VEX usually refers to a left and right pair of parallel bars. A DR4B is basicially 2 4-bars sat on top of each other, with one reversed. People aren’t counting the towers on the robot or the mid-way towers in between the two 4-bars.
A QR8B on that basis would suggest four 8-bar lifts on top of each other, which would be enormous, 11 or 12 foot.

8 Likes

Then would it be refered to as, a DR8B?

1 Like

we will say this lift has 4 quarters, each quarter is a singular 4 bar lift. wouldn’t it make it a quadruple (since it has 4 stages) 4 bar (since its stages are made up entirely of 4 bar lifts) lift?

1 Like

The first letter in the term (?)R(?)B is the amount of lifting bar sets there are in a lift. Since these are usually paired the best fitting words would be Double, Quadruple, Sextuple, Octuple and so on. The 3rd letter is the type of lifting bar set (4 bar, 6 bar, 8 bar, and even chain bar). The 2nd and 4th letters help describe what lift it is (R-reverse, B-bar)

1 Like

Yes.
This is a four bar:
downloadfile

This is a DR4B:
IMG_0558
Because there are two four bars attached to each other (hence the word “double”), and the top four bar is facing the opposite direction, (hence the word “reverse”)

A QR4B would be four (because of “Quadruple”), four bars. Basically, two DR4Bs on top of each other.

4 Likes

That’s a very detailed explanation thanks for the information.

Yeah so we can agree that this would be called a Quadruple Reverse 4 Bar (QR4B) rather than something else?

1 Like

Sure. I agree.
20 characters

But, on that note… QR8B… someone with too much time on their hands please build one.

2 Likes

if you made an 8 bar out of 35 hole long c channels, so maximum length, it would be somewhere around 36" tall. (this number was from me laying out c channel on my floor in an 8 bar shape and kind of estimating a bit, so its a very rough number)
if you had 4 of such 8 bars stacked on top of one another, that’s 144" tall. add maybe 12" for the lift towers on the base, and you have 156" tall. that’s 13 feet tall. Idk what the game manual says on the matter of breaking through venue ceilings…

5 Likes

What about a QR8B made out of skyrise 8 bars

3 Likes

QR8B but made with vex U sizing

3 Likes

As a newbie, i don’t have the time.

Usually, the cellings should be more than 13 feet tall. Most homes have at least 10 feet high ceilings. A public place would have much more.

This topic was automatically closed 365 days after the last reply. New replies are no longer allowed.