Machine Tool Peripheral Hoists

[Cornish JackParticipant @cornishjack]

Just noticed this thread.

The photos below show a bodge modification I made to an ex-car hoist for mobility scooters.I had to do a bit of rewiring and incorporating a transformer power supply (RS variable output). The base is 7" x 7" x 1/4" steel with corner holes for attachment. Original s.w.l. was, apparently, 160kgs (?) so probably OK for chucks etc. Not sure if I'll get round to installing it.

rgds

Bill

[Clive FosterParticipant @clivefoster55965]

Nice job Bill.

My feeling is that something of that ilk fitted to a work cart would be far more generally useful than something that needs to be specifically set up for each job. Sufficient reach to handle a lathe chuck or vice – dividing head – rotary table on the mill should be no problem.

On a rolling cart it also becomes very useful for the "really a two man lift" or "20 (30 in my case) years ago I'd have lifted it no problem" things. Several backs of envelopes and a couple or three years into the thinking I'm reckoning that something very similar with folding jib to get things out of the way when the cart is normal use and using my battery impact gun as the power source is plausible way to go.

In a practical world 150 lb or so lift ought to be plenty. A tolerance ring can make a nice emergency overload clutch.

As usual with like to have, rather than need it now, jobs feature creep and design refinements are getting in the way of do-it now. Fact is if I knew I wanted one on Thursday it would be done tomorrow. But for now I keep noodling.

Clive

[ChrisBParticipant @chrisb35596]

Posted by Martin Connelly on 30/05/2020 23:28:33:

Current rules for lifting equipment is that everytime is assembled it is to be examined by a qualified independent inspector before it is put into use. Good luck using one of these in industry now.

Martin C

How often must lifting equipment and accessories be
thoroughly examined?
You must have lifting equipment thoroughly examined:
■ before using it for the first time – unless the equipment has an EC Declaration
of Conformity less than one year old and was not assembled on site. If it was
assembled on site, it must be examined by a competent person to establish the
assembly was correct and safe, eg a platform lift installed in a building;
■ after assembly and before use at each location for equipment that requires
assembly or installation before use, eg tower cranes

Edited By Martin Connelly on 30/05/2020 23:35:16

At work we use various kinds of lifting equipment but was not aware an inspector was required everytime a lifting equipment was set up for use. The only requirement I can think of is the yearly inspection and certification, 6 months if used to lift persons.

[Martin ConnellyParticipant @martinconnelly55370]

I had to have a working knowledge of LOLER, PUWER and PED at work. This bit was a relatively recent addition. It caught quite a few people out where I worked when I pointed it out.

Martin C

[Cornish JackParticipant @cornishjack]

Thank you Clive.

Your suggestion re. the rolling cart is a 'bulleye'! Even I ought to be able to rig up something suitable. The obvious potential 'gotcha' is the counterbalancing but I shall consider … and, no doubt, procrastinate!

rgds

Bill

[ChrisBParticipant @chrisb35596]

Thanks Martin, I'll point this out to our H&S guy

[Clive FosterParticipant @clivefoster55965]

Bill

Considering the seemingly "permanent" contents of my work cart counterbalancing oughtn't be a problem for me. If more than half the top tray is clear I hear muted screams of "turn off the light". Two shelves and three drawers in addition to the top tray are seriously tempting. My version of Pooh Bears "useful pot to put things in". Appropriate I guess as Ashdown Forest is only a couple or three miles away.

Seriously a paving slab bolted underneath at the opposite end and a bit of orientation intelligence in use should suffice.

One thing that has hung me up over the design is wanting a longer jib so the crane can be used extended over the cart if anything hefty has to be lifted. But then it needs an extra fold so the hook can be set close in when working away from the cart. Do-able but I'd rather not have a 3 ft double pole sticking up on one corner. Then there is the controlled adjustment needed so whats been lifted can be dropped on the cart. Overthing, yup.

Clive

[thaiguzziParticipant @thaiguzzi]

Posted by Tim Hammond on 28/05/2020 12:49:51:

Last evening I watched a video on YouTube posted by Adam Booth (Abom 79 ) where he described and demonstrated a hoist he's just acquired called a "Sky Hook", used to assist in the mounting and demounting of lathe chucks, milling vices &c. on machine tools. It's safe working load is 500 lb, and it was mounted on the toolpost of his Monarch lathe. It occurred to me that this set up imposes a very high load on the toolpost,, enough probably to affect the integrity and accuracy of the machine. Many of the comments posted beneath the video echoed these concerns. Has anyone else seen this video? If so, would they care to share their thoughts?

Dont you start over this side of the pond as well!

This has nearly started WW III over at the Home Shop Machinist forum…

[Andrew EvansParticipant @andrewevans67134]

Adam Booth talks about the forces generated when taking 1/2 inch cuts in steel on his Monarch – has anyone got an idea of what they would be and how they would compare to the toolpost mounted Skyhook?

Edited By Andrew Evans on 01/06/2020 16:38:41

[Martin ConnellyParticipant @martinconnelly55370]

I'm not going to say if this hoist mounting is a good or bad design but as regards the forces acting on the tool I think there are probably examples of bent tools that give some indication of the potential forces from large cuts. It should be quite easy to work out the force required to bend a 12mm square steel bar stuck out 50mm for example.

Martin C

[thaiguzziParticipant @thaiguzzi]

Posted by Tim Hammond on 28/05/2020 12:49:51:

Last evening I watched a video on YouTube posted by Adam Booth (Abom 79 ) where he described and demonstrated a hoist he's just acquired called a "Sky Hook", used to assist in the mounting and demounting of lathe chucks, milling vices &c. on machine tools. It's safe working load is 500 lb, and it was mounted on the toolpost of his Monarch lathe. It occurred to me that this set up imposes a very high load on the toolpost,, enough probably to affect the integrity and accuracy of the machine. Many of the comments posted beneath the video echoed these concerns. Has anyone else seen this video? If so, would they care to share their thoughts?

Double post.

Edited By thaiguzzi on 02/06/2020 03:04:26

[HopperParticipant @hopper]

I like the counterbalanced cart idea, taking the strain off the carriage and toolpost. But it does rather put me in mind of this kind of thing:

[Cornish JackParticipant @cornishjack]

Clive – Thank you again for the 'mental nudge' re. counter-balance mounting. I have just the sort of thing you describe – ex commercial, foldable metal trolley on casters, covered with 'come-in-handy' items of considerable weight. Managed to 'clear a 7" x 7" space in the top shelf corner and the swivel boom swings to stay within the trolley outline. Sorted!

Once I get it bolted down, I'll take a piccie.

rgds

Bill

[Nicholas FarrParticipant @nicholasfarr14254]

Hi, just for information, thorough examinations and inspections for lifting equipment can be seen at Examination and Inspection for lifting equipment in the work place. Of course, one should always inspect any lifting equipment before use, regardless whether it has a current certificate or if it was OK yesterday, and this can be done by anyone competent to do so. Places of work using lifting gear should give you training how to use them correctly and how to inspect them for operational use.

Regards Nick.

[Nicholas FarrParticipant @nicholasfarr14254]

Hi, in my old job, they had a Colchester 1800 Mastiff that they discontinued from use and were looking to sell it, I was asked to find out how it was supposed to be moved, so I found the user manual and in it said to bolt the plate that was supplied to the bed (which was a short distance in front of the chuck past the removable gap piece) and lift by the eye bolt adjusting the saddle and tailstock to balance. The plate was about 30mm thick by 300/350mm long, from memory. I found the plate and put it with the lathe with the user manual, but I had left the company before it got sold or moved.

Regards Nick.

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