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| Darren:
If you have a look at commercial lifting units they'd scare you silly at just how flimsy they are, esp when they give a capacity of two tonnes or so. The gantry you linked looks as it it's good for 100 tonnes by comparison.....ok a slight exaggeration maybe.... :ddb: I like the design of your legs better, not that there is much wrong with his, yours just look stronger. But what is your span on these, it looks short in the picture? |
| jatt:
Between legs I am looking at 8 foot (2400mm). I will have some of the internal SHS (how much is yet to be determined) sticking out above the columns. I'm thinking about a foot at present. Hard to explain everything so there will be pics taken as I go. --- Quote ---If you have a look at commercial lifting units they'd scare you silly at just how flimsy they are, esp when they give a capacity of two tonnes or so. --- End quote --- Yeah I definetely agree there. Look at some of the engine cranes on the market. My local has a few Chinese ones. Dodgy... |
| jatt:
--- Quote ---I like the design of your legs better, not that there is much wrong with his, yours just look stronger. But what is your span on these, it looks short in the picture? --- End quote --- Oops I think I misread what u were saying. Yeah u are right, dunno what I was thinking. Yeah I'm gunna have t o buy some more SHS and make the column longer. Using up all of my scrap SHS on this job, dont normally have much use for this size normally. Good thing too, stuff this size starts getting expensive. Thinkin seriously about adding an additional wheel directly under the column each side, cause most of the downward pressure will be exerted on this point. Still considering how big to make the gussets that connect the I beam to the columns. Progress is slower than I would like as its an after work excercise. |
| Darren:
You won't need extra wheels, that bar isn't going to bend on you.....well not unless you try to suspend a whole tank from it.. Just think of this, with these types of devices all the weight inc the gantry is held by four little bolts in the wheels...... |
| jatt:
Sourced myself some HT bolts for the casters. 3 of the four casters have locks. What can I say I got a really good deal on them, especially considering the locking ones are normally dearer. Made my legs longer to allow more support for the telescoping SHS running thru the centre. Currently doing some mock ups to work out how I'm gunna support the rams. I need to be able to see something in the metal to work out how I will actually do the job. No not using the thin stuff that's shown in the pics. Somehow dont think welding ally to Mild steel will work for starters. Pics show my current ideas for the top and bottom mounts. The large piece of flat on the top mounting represents the I beam. Another foto shows the telescoping SHS. Add a gusset to the bottom mount and some 10 mm flat to connect the clevis pin to the ram. |
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