I know this is completely off topic, but have you been down to see how the gravity water pumps are going you looked at years ago? Never forgotten those few videos for some reason lol
Fitting all those floor pieces together looks pretty satisfying, I reckon you'll probably spend a happy half-hour or so sliding it all about when you've got it all glued together (I would!), It's going to be interesting to see how you lock the rear half in place as I can't imagine leaving it floating would end well but you'll need it to be infinitely adjustable to get all the wheels in good contact with the rollers. A couple of big lead-screws from an old hoist would be nice, you could have it electrically-adjustable then! Luxury!
Am hoping it should be fine as hydraulics once in stationary position are essentially rock solid....And cant move sideways, could always add something but fairly confident there wont be any problems there....
@@darrenjlobb Hydraulics would be perfect, go with closed-center valves if you've got some, it might mean your pump will push through pressure-relief, but you'll not be using it for long enough to cause problems. But you probably thought of that already!
Nice work! Some tips if you're interested:) Instead of using two separate on/off valves for the airlift you can use a pneumatic 3/2 valve. My dyno is one half off a AWD dyno and it has roller just like the one you made, but they are made off solid steel. The dyno also have a pin in the frame sticking out straight down. I think that it was sitting on a steel track made off a flatbar with a slott that guided the dyno from wandering sideways.
A 3/2 valve would work also... Although would mean either up (under full pressure) or released, wouldnt be able to stop it mid way / hold it in a certain position which is handy sometimes.... The valves are just the typical chinease cost effective units, not something id recommend in most cases, but for somethings thats only used in short periods, they seem to be very reliable / never gave any problems before anyway..... That would make sence with the pin, you would certainly need something, I had several different plans involving linear tracks to start with, and then two lengths of chain that the dyno would use to run on, but in the end decided it was all just overcomplicating it and making it more expensive, so just using the chassis around the outside now to sandwich it / prevent any sideways movement, and hydraulics to move / lock it in position...time will tell!
Superb Darren! Great bit of fabrication, what is the maximum/minimum wheelbase specs? Looking forward to see how your locking the moving Dyno in a stationary position..👍
Should allow for 2250mm up to 3300mm wheelbases (Could extend more by pulling pins and center bolts but shouldnt need to), with regard to locking it, Im hoping I shouldnt need anything the hydraulics when stationary are essentially solid.... And it cant move sideways as locked inbetween the chassis rails, so hopefully shouldnt be a problem.
If you go down Colin’s of Probus and ask Gary Colin’s if you can have a look at his 4x4 dyno it is one hell of a thing built by and engineer called AJ from Truro it started off exactly like yours just two separate dyno’s
@@darrenjlobb might have been I know the engineer definitely built all mechanism with the wheelbase variation and the platform between the roller sets he also done all the extraction and cooling turbines too he’ll of a rig down there
Seeing what happens when something like that finds it's way into the rollers is a pretty good motivator for keeping the dyno area pretty tidy! I did my apprenticeship in an HGV shop with tacho-rollers, one day somebody accidentally kicked a big wheel-nut under the spinning rear tyres of a truck under test, it shot from the rollers so hard you could see daylight through the steel door behind, it hit at around head-height too! thankfully we had the door shut that day as there were customers' trucks parked outside!
@@theafro it’s the stuff embedded into the rollers that worries me maybe steel rollers would be better stop swarfe Ingres. The kick up of stuff should be minimal as the synod rollers are above any problems
Its an interesting comment you bring up,not something I had hugely thought about... Can see where your coming from but would hope that area of the workshop is to be kept fairly tidy, shouldnt be any reason for metal swarf / objects to be lying around there.. Only a five minute job to quicly blast around it / all the tracks off with air lance after each session if you wanted to be super safe.... But I dont think it will be much of a problem...
