Thread: What did you learn today?

Originally Posted by Oldneweng

I think that the flat bar you suggest is overkill. Your idea in the diagram is fine. When looking at the picture last night, my thought was to use 13mm reo which has enormous strength in tension compared to what you need. This should easily fit inside the girder trolley without interference and would be easier to weld to the T-section. Having said that the flat will work ok.

Consider the fact that there is a weakness at the middle point between the vertical post and the outer end of the brace. If it was me, I would add another vertical post at this point and then a brace from the top of this post, back to the base of the other post. This is also probably overkill, but it is my experience that when you have to fix something up it is better to take big steps and over engineer.

I would do it this way rather than the flat welded on top, as this way will add far more strength. I have gone thru the same issues with my lifting trailer and I can now lift some serious weight with it.

I intend to make a similar crane in my shed, which will need to extend a long way as the only possible location is on the other side of the shed from the mill and final lathe location. Something that will need some thinking about.

Attachment 316654

The red lines represent what I did to my lifting trailer to add strength for lifting from a central position. This was the point the hay bale lifting cable was attached. It also gives me the ability to lift huge weight at this point. I have lifted the shaper at the tip of the boom. That is 700kg. The tip also extends by about 450mm and now has adjustable bracing as well, but that is another story.

Dean

ps I realised the flat is to be welded vertcally so welding is a non issue. Disregard that comment.

Dean et al,
I straightened my jib crane today in the press and welded on your suggested design of a truss. Rigid as anything! Thank you for your help! "SWL - YES" Painting was out of the question today - only 6.5deg max....
I think the weak point is now the vertical column/pivot, or the bearings top and bottom (taper roller trailer bearing at the bottom, self-aligning single row at the top - or indeed the bolts that hold it all to the shed column - or the shed portal frame

IMAG1283.jpg

I'll test it tomorrow lifting the Cash mill column on to the base (horizontally) for scraping the vertical ways....

Originally Posted by jhovel

Dean et al,
I straightened my jib crane today in the press and welded on your suggested design of a truss. Rigid as anything! Thank you for your help! "SWL - YES" Painting was out of the question today - only 6.5deg max....
I think the weak point is now the vertical column/pivot, or the bearings top and bottom (taper roller trailer bearing at the bottom, self-aligning single row at the top - or indeed the bolts that hold it all to the shed column - or the shed portal frame

IMAG1283.jpg


I'll test it tomorrow lifting the Cash mill column on to the base (horizontally) for scraping the vertical ways....

hi joe looks great . and handy to. Haven't you got any thing thats not a mill to use as a test
weight?
aaron

yes, I have: it lifts me (90kg) just fine without any deflection

Originally Posted by jhovel

yes, I have: it lifts me (90kg) just fine without any deflection

not what i was thinking of but effective the same. did you travel your self along the boom?

Originally Posted by jhovel

yes, I have: it lifts me (90kg) just fine without any deflection

Sounds an awful lot like how i tested mine, only i tested it to 110kg

Ew

Originally Posted by jhovel

Painting was out of the question today - only 6.5deg max....

I learned I'm never moving to Bendigo.

OK, the heaviest thing I'm likely to lift with the jib crane has been lifted without any problem:
IMAG1284.jpg

Originally Posted by jhovel

OK, the heaviest thing I'm likely to lift with the jib crane has been lifted without any problem:
IMAG1284.jpg

Joe,

Looks like you "lifted" a cashbox.

Andrew

Originally Posted by jhovel

OK, the heaviest thing I'm likely to lift with the jib crane has been lifted without any problem:
IMAG1284.jpg

good one mate. I was just having a peeve at your workshop. Whats the machine to the left of the mill?
i like your draws and thats an impressive linisher. that would have teeth.

Originally Posted by Bryan

I learned I'm never moving to Bendigo.

If it was 6.5 deg at Bendigo then I'd hate to know what it would be like at the Rat!

Simon

Originally Posted by simonl

If it was 6.5 deg at Bendigo then I'd hate to know what it would be like at the Rat!

Simon

When the build one man shelters for the lollipop people you know its not going to be warm in the mornings

Stuart

At least thats what I assume they are for.

Azz,
left of the mill is the lathe (see other thread) and the linisher is home made (not by me) and pretty good. It's not as big as it looks.

Originally Posted by simonl

If it was 6.5 deg at Bendigo then I'd hate to know what it would be like at the Rat!

Simon

If it was that warm Simon, I would have to take my jumper off.

Phil