I bought a secondhand monitor and it was delivered with MH – broken. To be fair it was also packed badly and the guy forgot to write “Fragible” on it.

Courier who came to collect it turned up in a Focus with his 6 year old daughter in tow!

What a bellend. Reported the new link…

Oh wow, ‘morning!

Yes, don’t worry – I know. Currently the unit weighs around 28 and is handled in two separate parts.

Leave, now – don’t look back.

OK, ta.

Hey, compositepro, could you engineer it if it was carbon fibre? I bet that it would suit the application – light and stiff!

Hi guys.

I think i will do as Greyboard says. TBH a disclaimer was in the plan from the start*, and I have kept and dated my calcs to show I have used all the care I can, but as you have rightly pointed out my engineering maths is pretty pants for some reason [IDK – I excelled at all my coursework and Maths for engineering exams, but I haven’t used it in a year and a half and with no-one here doing anything similar I seem to have brain-rot].

Thanks for all your help, and I take comfort that there’s nothing like this on the market, so either we’ve had a unique idea or it’s damn hard to make such a device.

I have done only 2 years of an undergraduate Product Design course, and it would seem there’s a reason for the other 5 years required for CEng status, eh?

I do feel disappointed that I haven’t been able to get this sorted from the structural point of view, but I guess I just need to up my game significantly before I can handle this sort of calculation. Esp as I was 69.4% average last year and I want a 1st, dammit 🙂

Hope you all have a lovely evening and no badly engineered platforms collapse under you 😉

*Not that I thought I’d get it this wrong, but I realise my boss is rather want to rush into things, and I don’t want someone’s injury on my hands because they didn’t check what certs this would need.

EDIT: Yeah I’ve got a copy of the WAH, but we’ve got a very fat** engineer and I really wanted him to be able to use it if there’s a way he can legitimately, I was going to let the legal bods look into that.

**He is also a lovely guy, just bloody huge!

Dunno, the capacitance and resistance presented to the amplifier must both change a little with biwiring.

Depends on the gear tho… My amp seemed not to like the load of just a tweeter and the sound was strident.

It would have to be a very small forklift…

Oh, frank, that reminds me – I have been reading a couple of other threads and I have the solution to your “overgrowth” issue:

Rock Salt. Apply liberally, it will kill of the growth and also has the bonus of being antiseptic. Just shove a load of coarse-grains down your crack and you’re good to walk all day 🙂

+1 🙂

Dude, I can’t calc a damn spannering podium….. o.O

Haha. Nice to see someone else’s big mouth getting them a load of trouble, for once! 😆

Options:

1) Ask his shift and be standing outside with a beer or 4 when it’s up.
2) Buy him a new flesh tunnel*.

I took a couple of tips in Halfrauds, but it was a bit nervy. AFAIK the CCTV can be viewed by the Area Manager, live!

*A fancy anodised Chainring bolt should work in a pinch.

Just swap the PSU out – we’re likely stabbing wildly in the dark here and may injure ourselves in the process.

wut?

^^^^ sort it out, again, kimbers 😉

Oh damn – I know now, I should have used “WEAPONS GRADE ALUMINIUM”

Sounds fair to me. I sketched it with a pair of parallel rising members on the other page – looking at the 2Ton crane I posted I figured out why it was strong, as you said it has a pair of members, one in compression [beam>bottom of rising beam>ram>bottom] and one in tension [top of rising beam/supports] – much as you said if you view it in 2D.

Whenever I hear a siren I get under the desk and start praying to Bob.

OK – I need a plan.

The boss loves the look of this concept, so:

*I’m going to finish adding the rails to it.

*Check the loading on the supports and beef them up as much as possible in the space.

*Get it made and tested.

*Meanwhile, I’m going to work it over seeing if I can do a better job of the engineering calcs, as I clearly need to have a more accurate grasp of the forces if it is going to be much cop without having a firm re-engineer it. I’d better go and explain to the Director.

WRT Support – no they haven’t been able to give me any time or help, but I am also a bit to blame for not asking for more I guess. Maybe I was foolish, proud – I really thought I could do this on my own [esp as we have a couple of access platforms which hold 150kg and they weigh about 10kg in Al. But then again, they are made with only vertical or horizontal members…]

Please feel free to suggest any changes to Mk2 🙂

hehe – The fat man weighs 23 stone and he might have several tools with him or a 30kg bottle of liquid – I just rounded up.

the unit does come apart – but I am worried about it taking too long to assemble. The job the platform is required for will only take 20 minutes to complete, so adding much assembly time is a -ve point for the design goals.

😆 OK but that’s what we’re tying to get away from.

I’m going to have a smoke and get my head together.

RE Proof testing – is this the case even if it’s for the companies own engineers – we’re not going to sell it? What’s the ballpark price for that? I don’t think the boss knows!

Aww hell – this would be much less stressed wouldn’t it – though they would probably be better if they were vertical.

I can’t believe this, I should have never said I’d stay on.

yes – rails are on the way – I think I have a way of adding them without changing the rest of it.

Dammit why does this work with 2000kg?!

Usage scenario – I’ve been a bit shy to show the whole thing, I have never screwed up this bad before and I feel bad asking for so much help…

Yes it needs to be carried in [or al least handleable – spot the handles on the two separated sections]

In this pic you can see that some units it’s designed to go over are quite deep, so the attachment points are limited by the space available along the feet. There is also the issue of how much space it takes up under the units – there is <100mm available there too

No – I seem to have totally misunderstood the forces – I basically thought it was a massive compressive load on the 3″ 1500 strut and didn’t realise the 15 degrees would generate such a load on those small beams. Just calculating I now…

Thanks for all your help guys I’m srsly pooping in my pants about this.

Counterbalance would be great, but no space

it also has to be carried in by one guy and unpacked in a space 700mm wide 🙁

Here’s a pic of the whole thing – I’m severely limited as to it’s size and weight because it needs to weigh around 30kg and be around 4-500mm max depth from the pivot of the top platform away from it [ie the space the steps take up]

oh wow – well I was asked to give them a rough prototype concept and they will test it. I came up with the idea for a cantilevered structure as resting on the top of the variable surfaces was unlikely to allow the structure to be deployed and adjusted quickly. However since starting this I have been told we’ll get it tested with a 200kg sandbag and if it passes we’ll try rolling them out.

I am quite concerned as I thought the next step would be to an engineering co to calc the tubes etc required, but it seems not…we don’t have FEA plugins for Solid Edge so I really don’t know what the forces are, as I said I thought it was going to be worked-on after me.

I don’t know what to do – this is supposed to be fabricated ASAP

crap crap crap – this placement has been a nightmare and I’m shit 🙁

EDIT – I have asked everyone around that seemed to know what they’re doing and the fabricators and we all thought it would be in the ballpark. AFAIK if it deflects it’s going to fatigue and break anyway even if it hold the static weight.

for the fat guy? Naah – he’s the relation of the 2nd most senior staff member…. 😉

That’s very kind.

I’m really beginning to think I’ve screwed up here – this is not going to sustain the forces is it…? I previously thought the A member was 1″ square Al, now it’s looking like it needs to be a huge piece like the others…

Bugger.

And it was all going so right before “Just one more little project before you leave” 🙁

also your angles are wrong if top and bottom are parallel

the top angle should be 75 (as at the bottom) not 68

All the PJ’s on the longest member are attached on the centerline with the exception of the topmost which is shifted to the right [see pic]

TBH AFAIK the top triangle doesn’t do anything WRT this lower support, but I included it in case I was wrong and it’s needed.

yes – it’s 76.2mm Square 3.2mm Wall 6082 Al per side.

This is a concept for the item, It needs to be feasible with some tweaks.
Sadly I’m on my own here, and I don’t don’t know how to calculate these forces 🙁

Shirley it’ll bring your weight back, and move the CoG? That will make a difference!

The one in the white bowl is Bruennichi’s Argiope.

Linky

List of biting spiders from Natural History Museum Website

If you don’t look like a fly I wouldn’t worry. 🙂

Just escort off the premises.