Car ramps - Page 4

jeffstevens763@g · 29 March 2021, 20:34

Trent plastics have reasonable prices, conveyor belt grips a bit rubber and rope mix, HDPE bit like ice

Limecc · 29 March 2021, 20:37

Quote:

Originally Posted by Sargan

I think uPVC drain pipe may be too hard to provide protection, but HDPE would be softer.
You need something with a bit of give. Have to think where I can get HDPE from.

Like Jeff says.

I just got some 25mm HDPE sheet from Trent Plastics who also sell on eBay. Not sure it's as soft as you think, nylon might be better? Local supermarket might have a 6mm chopping board you can bend with applied heat?

Quote:

Originally Posted by jeffstevens763@g

could do with a pic like this

Yes it's definitely eye candy.

jeffstevens763@g · 29 March 2021, 20:44

Yea it’s not soft but the keel will slide well if you want soft Astra turf would work free samples if you look on the web

Sargan · 29 March 2021, 22:39

HDPE is what I’ll. look for

Sargan · 30 March 2021, 07:48

I know that there are also ppipes made of MDPE (water mains) would you know if MDPE would aslo be suitable, not sure of the difference between the 2 in terms of hardness,

Orwell boy · 30 March 2021, 15:24

Best approach IMO would be to ring sbs and get a price for a galvinised x member to suit your trailer with two fixing u bolts and a nice wide keel roller ,alternately buy a 2metre piece of 60 x 40 x3mm galvanised rhs and make one yourself ,position so you are higher than the axle but lower than the swingers ! ,if you are going to send for galvanising yourself make sure you have no paint on the metal otherwise they will charge addition for shot blast !

Sargan · 30 March 2021, 16:36

I have already been to SBS, their rollers expect to be fitted to square section tube, not the axle.

They suggested pop-riveting on the following

Poly · 30 March 2021, 22:13

Quote:

Originally Posted by Sargan

I know that there are also ppipes made of MDPE (water mains) would you know if MDPE would aslo be suitable, not sure of the difference between the 2 in terms of hardness,

MDPE will scratch easier than HDPE - whether that matters, at least in the short-medium term is a different question.

Sargan · 30 March 2021, 22:31

I have ordered a piece of 15mm thick HDPE
I could just cable-tie on, but will try and find an adhesive .... be good if I can get a flexible rubber or silicon style adhesive ....
I am aware that you need to heat treat the surface with heat gun to de-wet the surface prior to bonding.
I have some 3M 5200 which bonds most things marine, but don’t think it suits HDPE.

Anybody know of a silicone or adhesive.?

Poly · 30 March 2021, 22:44

Nothing sticks to HDPE (well not quite nothing - but near as well). There is one expensive specialist glue (it sticks to other plastics not sure about metal), and needs very good surface prep. I've used sikaflex to create a seal, but I could easily peel it off - so not for an application where it carries a load. If you really want to have "fun" you can "weld" it.

(My whole boat is HDPE)

Sargan · 30 March 2021, 23:02

I know of one .... ‘Mr Stick’s Poly Bond’
Just trying to see if anything cheaper, or maybe something I have.

No more nails, Sticks like S***t, etc.

Poly · 31 March 2021, 07:43

Quote:

Originally Posted by Sargan

I know of one .... ‘Mr Stick’s Poly Bond’
Just trying to see if anything cheaper, or maybe something I have.

yeah I think there are 2 or 3 different brands of essentially the same stuff, none cheap, and not easy to just pick up in the hardware store/chandler either

Quote:

No more nails, Sticks like S***t, etc.

no - none of your traditional glues will work - even epoxy and sikaflex which in my experience stick to everything! Annoyingly some of these things actually look like they've stuck but debond with very little force after several days.

Sargan · 31 March 2021, 07:45

Can you name any of the ones that will.

Poly · 31 March 2021, 08:00

3M do a product - I think it's Scotch Weld? IIRC it was about £30/tube last time I looked!

Sargan · 31 March 2021, 08:38

Scotch Weld is a sub-brand, large number of glues are Scotch-Weld something.

I’ll try asking 3M. - Thnx

jeffstevens763@g · 31 March 2021, 09:11

off the web

Cyanoacrylates Cyanoacrylate adhesives
Cyanoacrylates. Cyanoacrylate adhesives can be used along with primer Permabond POP. Cyanacrylates set almost instantly and provide good adhesion to HDPE provided the surface is pre-treated with Permabond POP primer. The bonds have good resistance to non-polar solvents but do not fair as well with polar solvents.

Sargan · 31 March 2021, 09:37

Cyanoacrylate adhesives = Superglue
I have had very poor experience of this type of adhesive, and I think very thin film adhesive not ideal in this situation ..... will continue to try find rubber flexible type.
The 'Mr Sticky's Poly Bond' seems best option so far, found a 3M variant but 3X the cost.
Maybe I'll try fixing with cable ties first see what fixing is like.

jeffstevens763@g · 31 March 2021, 10:12

i use a lot of this a pig to get off when cured

https://sealantwholesale.com/product...gn=sag_organic

_monkey · 31 March 2021, 11:24

I assume the axle is uniform, so you could clamp a keel roller to it - it would point up at 45deg:

Sargan · 31 March 2021, 15:50

Quote:

Originally Posted by jeffstevens763@g

i use a lot of this a pig to get off when cured

https://sealantwholesale.com/product...gn=sag_organic

Had a reply from Everbuild / Sika support .... they do not have an adhesive that will work with HDPE. Standard Hi-grab adhesive sealant will initially work, but the HDPE will form a new surface and bond will fail.