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Thread: 700mm lift design question
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12th Aug 2020, 11:59 AM #1Member: Blue and white apron brigade
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700mm lift design question
I'm looking a buying a mitre saw mainly for WW but I will also be cutting Al with it.
I have next to no room in my shed but have found a 600 x 900mm area, sort of under a bench that I could use to at least store it.
My proposal is to have the saw on a low wheeled trolley so it can be rolled out from under the bench and then raised to working height.
The saw weighs over 30kg so it's not exactly light and will need some mechanical method of raising and lowering the saw.
The height it will need to be raised is about 700mm.
I was thinking of a scissor screw jack action, but 700mm is a long way for such an action.
There are some very nice commercially available sack trolley type gizmos for mitre saws that fold and jack up mitre saws to working height but I don't have room for any of these in the proposed location.
Any design ideas from any punters would be appreciated.
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12th Aug 2020, 02:28 PM #2Most Valued Member
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Apply the hierarchy of control at a higher level, your solution is an engineering level, I’d be looking at the king of the kids, elimination.
Buy a lighter saw, and clean out some stuff to give it a home where it doesn’t need to be lifted. Let’s face it, at least 50% of what we keep in our sheds/garages/workshops is just useless stuff we don’t really need other than to satisfy our materialistic hoarder tendencies.
I sold off my 35kg 14” behemoth in favour of a 6 1/4” battery powered one I can lift one handed. Looks like a toy, sounds like a toy, definitely not a toy.
A chain block above the bench and a slide out shelf to sit the saw on
Linear actuators if you want to level up on over complicated.
Alter the bench to have the saw under mount on a pivot.
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12th Aug 2020, 05:06 PM #3
Hi Guys,
I designed and built my circular rise and fall saw about 12 years ago. 10" inch TCT blade 2880 rpm, no tilt. The whole thing occupies about 16" inches square and uses a shop vac for dust extraction. I should still have the drawings in my computer backups. I'll dig them out and post them if anyone is interested !Best Regards:
Baron J.
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12th Aug 2020, 05:48 PM #4
Hi Bob,
My suggestion would be a multi layer scissor jack system, a la a scissor lift. A single actuator pulls the two control pivots together raising the first stage of the lift, and making it narrower. The second and any subsequent stage arms are pinned to the ends of the controlled arms and automatically lift as the systems becomes narrower etc. a 4 stage system would need to achieve about 150 mm lift per stage allowing for 100mm for the top base and castors if fitted. Can be made with the actuator at any set of pivots from top to bottom to suit where you would like to activate it from, actuator could be a screw and nut, pneumatic, hydraulic, linear actuator or cord and pulley set with a clamp, lots of options available for a capable and inventive person like you.I used to be an engineer, I'm not an engineer any more, but on the really good days I can remember when I was.
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12th Aug 2020, 07:02 PM #5Most Valued Member
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12th Aug 2020, 07:11 PM #6Member: Blue and white apron brigade
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Thanks for the ideas - much appreciated.
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12th Aug 2020, 08:34 PM #7
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12th Aug 2020, 09:42 PM #8Member: Blue and white apron brigade
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I like the upside down swing idea except that the proposed bench it's going to be stored under is not really a bench but the LHS CI wing of the Table saw.
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13th Aug 2020, 03:16 PM #9Most Valued Member
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Still doable, you just need to be a bit crafty with your mounting and pivot, possibly a brace to support the wing of the saw.
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13th Aug 2020, 10:11 PM #10
Scissor lift trolley is what I use in the shop. Like the fact that I can simply raise and lower to the required height.
Get the fact u have a space issue (dont we all). Space always seems to be a juggle.
When mine isnt being used to move die sets around between press and wherever I have them stashed, it gets used as a mobile table. Some of the dies are on a shelf under the bench, some sitting on top.
I just lock in a couple of casters so it dont try and roll off on me.Frisky wife, happy life. Then I woke up. Oh well it was fun while it lasted.From an early age my father taught me to wear welding gloves . "Its not to protect your hands son, its to put out the fire when u set yourself alight".
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13th Aug 2020, 11:01 PM #11Member: Blue and white apron brigade
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14th Aug 2020, 12:01 AM #12
If you have the room it's probably your best option, and I'm sure you could make one, or if not power a commercial one for effortless lifting.
Guys are 3d printing battery holders for all brands of batteries operated tools these days, so you could use your shop brand battery tool to power it up.
Unlike me I honestly couldn't fit one in my shed, it would restrict my walkways, lolUsing Tapatalk
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14th Aug 2020, 04:33 PM #13Member: Blue and white apron brigade
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About the last available spot for anything in my shed is under the LHS cast iron wing of my TS. My "plan" was to store the mitre saw on a trolley under that wood and pull it out into a walk way and use it these. My shed has a figure 8 race walkway round it so even if one walkway is blocked I can go teh other way. I have a couple of nearby flexible dust extraction hoses so I could make a 1/2 box like shroud around it and plug in as required. the other alternative is to wheel it outside to use it.
I've looked at a few commercial scissor jack trolleys and there are some issues to to sort. To get the required jacking range (700mm) I'd have to go for a heavier duty (550kg+) lifter. But these have too high a the minimum height so with the mitre saw on the trolley it wouldn't fit under the TS wing.
So the question would then be would it be quicker/easier to build my own or modify a commercial scissor jack trolley.
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14th Aug 2020, 06:21 PM #14Diamond Member
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Hydraulic lift trolley would be ideal.
I wouldn't bother making one though, I pickup up mine second hand for $50, it has a slow leak so will eventually go down. When I have it at the required height I just use a stop block (piece of wood) that I made up so it will never come down.
If you found one cheap enough you could probably modify it to suit your height requirements.
Sometimes I store mine vertically if I need the room, the handle and the foot pedal come off and it takes up very little room this way.
If sure if you had one you will find outer uses for it as well. I've dragged heavy stuff from my ute tray onto it such as engines.
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14th Aug 2020, 11:35 PM #15
When I got my hydr lift I purchased one that would go up the height I needed (about 800mm). Without measuring not sure how low it drops down to.
What I do know is its an invaluable piece of kit in the shop. My larger dies, although not big by commercial standards, are still quite heavy. Table top is large enough to take one out of the press and push another in around it, without having to do a shuttle run.Frisky wife, happy life. Then I woke up. Oh well it was fun while it lasted.From an early age my father taught me to wear welding gloves . "Its not to protect your hands son, its to put out the fire when u set yourself alight".
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