Recent content by thijsdb

Without the housing you mean? A device you just role over the tube while you can walk around with it.. I agree this is a much more economic (in every sense) solution. also there are even simpeler ways of dispensing a tube, just with a key and a kind of 'hairclip' you put around the tube and...

Yes indeed load case 1 is statically indeterminate, that is i think the problem stated in the #1. Load case 2 is the one I drew in my last picture and which Unrest is referring to in #11. For me this is fine, since the load case 1 only occurs if the roller friction is NOT sufficient and the...

haha! actually we are developing it for oil paint, since the product is about saving the expensive contents of the tube. oh and it's "thijs" by the way :). NVN I also don't understand it: right now I can calculate the moment on the roller given the moment on the key. With this I can calculate...

You are right, I thought the 3rd gear was not in equilibrium, but i didn't look properly at the directions of the moments and forces on the 3rd gear. Naming the small drawn moments 'msmall' We can also conclude that m - msmall = msmall, hence m=2*msmall from the 2nd and 3rd roller. Thanks so...

The only assumed load here was the moment placed on one of the rollers, the vertical force Ftube in the 2nd attachement was placed there in order to compensate the two other vertical forces. But since I think the weight of the tube is negligible, the tube won't be in equilibirum, so Ftube must...

"False. Moment m does not need to be in the centre. Fa equals Fc. And your second attached file is correct." indeed, that was false.. However m cannot be 0 since we assume it not to be ( we try to establish an equilibrium when this moment in applied, i.e. when we don't turn the key hard...

Hi Unrest, thanks for your reply. I realize the stretching force is upward and the other one is downwards, so that means 2 forces on each roller (drawn in 1st FBD in a not well chosen direction). But I concluded that the resultant force should be downwards, given the forces on the side gears of...

Hi there, I'm trying to get a grip on this 1930's toothpaste dispenser. The basic idea is that you place a tube in de dispenser between the rollers, and then rotate one of the rollers with the key in order to dispense some toothpaste. Since the gears are connected to the first roller, the...