The British Construction Equipment Forum

The British Construction Equipment Forum (http://www.ceforum.co.uk/index.php)
-   Technical Q&A (http://www.ceforum.co.uk/forumdisplay.php?f=20)
-   -   Bolt on pin cradle (http://www.ceforum.co.uk/showthread.php?t=8726)

grahams 16-05-2017 06:09 PM

Bolt on pin cradle
 
1 Attachment(s)
Since Hewden going skint I've been looking round to find another self drive hire company that covers where I go. Tried A Plant and they are okay, but as I needed a long reach I tried HE Services. Used them years ago, but stopped when they started using their own hitch as it was such a precision fit even the buckets from the depot often didn't fit. They have a new Masterhitch design, so thought I would try them again. Really nice machine and good service, so going to make my own pin cradle to bolt on to my attachments rather than hiring one each time. Believe it or not their hitch for 10t to 17t uses solid 100mm pins and 30mm plate. The cradle weighs 280kg. My others weigh about 70kg. It seems silly to hang that out at 15m, just asking to make it unstable. Anyway, I'm after advice. I thought I would make the pins of thick wall tube, but had no idea how I work out what thickness I need. I'm only working in sand and I'd pull the mesh out of my sieve if I went mad with it.
Anyone any ideas?
Thanks
Graham

doobin 16-05-2017 06:36 PM

Re: Bolt on pin cradle
 
Quote:

Originally Posted by grahams (Post 153903)
Since Hewden going skint I've been looking round to find another self drive hire company that covers where I go. Tried A Plant and they are okay, but as I needed a long reach I tried HE Services. Used them years ago, but stopped when they started using their own hitch as it was such a precision fit even the buckets from the depot often didn't fit. They have a new Masterhitch design, so thought I would try them again. Really nice machine and good service, so going to make my own pin cradle to bolt on to my attachments rather than hiring one each time. Believe it or not their hitch for 10t to 17t uses solid 100mm pins and 30mm plate. The cradle weighs 280kg. My others weigh about 70kg. It seems silly to hang that out at 15m, just asking to make it unstable. Anyway, I'm after advice. I thought I would make the pins of thick wall tube, but had no idea how I work out what thickness I need. I'm only working in sand and I'd pull the mesh out of my sieve if I went mad with it.
Anyone any ideas?
Thanks
Graham

I'd have said it would be easier to source solid pins than hollow pins with a thick enough wall. At 30mm the plate is where the weight is! :eek:

grahams 16-05-2017 07:15 PM

Re: Bolt on pin cradle
 
I'm going to reduce the plate thickness to 20mm and reduce the height of the sides anyway. I am confident 20mm is more than sufficient going on what I currently use. 15mm would probably do it, but I don't want to overdo the weight saving and have it twist.
100mm pins must weigh a lot though.
Graham

V8Druid 16-05-2017 07:35 PM

Re: Bolt on pin cradle
 
Quote:

Originally Posted by grahams (Post 153906)
I'm going to reduce the plate thickness to 20mm and reduce the height of the sides anyway. I am confident 20mm is more than sufficient going on what I currently use. 15mm would probably do it, but I don't want to overdo the weight saving and have it twist.
100mm pins must weigh a lot though.
Graham

what length are they Gra ..... 100 dia solid is 61.654 Kgs / M mate .... they're having a laugh using 100 mm pins

you could try finding some 101 CHS with a 5mm wall ..... 88.9 will then fit inside that and is available in 5mm too and if you wanted to go again, 76.2 is also available in 5mm but is not a totally snug fit like t'other two.

Finding some 100mm CDS with a decent wall thickness might take some doing, but you'll be looking for engineering tube.

TBH I'd be pretty sure the 101 + 88.9 would be more than man enough to be gripped by the hitch ..... as you say ...... 't'aint gonna be getting grief.

20mm plate and 15mm cheeks'd probably be fine too Boyo.

What width is the hitch and what centres are they at ...... hell of a thing on a 10 t machine :eek:

V8Druid 16-05-2017 07:39 PM

Re: Bolt on pin cradle
 
15mm plate is 117.75kg/m .... 20mm is 157kg/m ;)

if anyone wants steel weights ever ... just ask .... got more section books and references than you can shake a stick at ;) :D

grahams 16-05-2017 08:43 PM

Re: Bolt on pin cradle
 
Quote:

Originally Posted by V8Druid (Post 153907)
what length are they Gra

What width is the hitch and what centres are they at ...... hell of a thing on a 10 t machine :eek:

On cradle pin centres are 400mm, inside width is 415, so pins are best part of 500mm.
Graham

mogman 16-05-2017 11:08 PM

Re: Bolt on pin cradle
 
What you need is some 4" drill tube;)

If I remember will have a look in the yard tomorrow

V8Druid 16-05-2017 11:13 PM

Re: Bolt on pin cradle
 
Quote:

Originally Posted by grahams (Post 153911)
On cradle pin centres are 400mm, inside width is 415, so pins are best part of 500mm.
Graham

Jeeeeezus ..... would love to see that on a 10 tonner ... what a beast of a hitch .... must weigh quite something on its own :eek:

So you've got 62+ kgs of pins Gra ...... very short centres though ..... same as the 'Drema's Miller, but that's 70mm pins :rolleyes:

V8Druid 16-05-2017 11:14 PM

Re: Bolt on pin cradle
 
Quote:

Originally Posted by mogman (Post 153926)
What you need is some 4" drill tube;)

If I remember will have a look in the yard tomorrow

aye ..... be ideal Mog ..... IIRC 12 or 14mm wall ...... but 102mm OD, at 4" :(

grahams 17-05-2017 01:30 PM

Re: Bolt on pin cradle
 
Just having a look on line. Seems nearest is going to be 4 inch od which is 101.6mm. I'll have to have a proper measure and see if it is within tolerance.
Came across cold drawn seemless tube with 4.8mm walls. What do you think?
Graham


All times are GMT +1. The time now is 12:21 PM.

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.