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Thread: 150mm OD HDPE needed
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16th February 2015, 11:47 AM #1SENIOR MEMBER
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150mm OD HDPE needed
Yeah I know it isn't metal but it's for a metal boat.
I'm making up my bow rollers for anchor handling. I foolishly assumed that 150mm OD HDPE or UHMWPE would be a standard item at a big plastics shop in Hobart. Hah.
Anyway I need 2 pieces of 100mm each or longer. Happy to buy it if someone has a source or some offcuts in their 'might be useful some day' collection. I've emailed E-Plas in Melbourne so I know about them - haven't got a response yet though. Nor have I from the local people, much to my amazement....
Not desperately urgent as in, I don't need it tomorrow. Just I'm about to weld up all the stainless pins, brackets etc etc and after that I'd like to paint everything that needs painting (including the stainless because it's easier than passivating & polishing it) and break down the scaffolding. So it'd be nice to slip in the rollers and call it done.
I've already thought of making them up from laminations of say 25mm thick flat pieces. I don't want to do that. PITA.
So...... ?
PDW
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16th February 2015 11:47 AM # ADSGoogle Adsense Advertisement
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16th February 2015, 12:24 PM #2future machinist
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We have ordered many different plastics at work from http://www.bplastics.com.au/ might be worth an email they are in Blacktown.
BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE
Andre
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16th February 2015, 12:44 PM #3Intermediate Member
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Dotmar?
http://www.dotmar.com.au/
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16th February 2015, 01:32 PM #4GOLD MEMBER
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PDW, when I want stuff like that I go to the local plastic tank manufacturer and they pour a billett for me and its ready the next day.
rgds,
Crocy.
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16th February 2015, 05:23 PM #5Philomath in training
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We have a Dotmar around the corner from work. If you can identify what you want I could go around at lunchtime, get it and post/ freight through.
I reckon my "useful" collection stops at around 60. I'll check when I'm next out that way.
Michael
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16th February 2015, 06:38 PM #6
My "handy to have" UHMWPE bar stock tops out at 80mm diameter ... the local bearing place carries it, so maybe check out the local bearing places.
Ray
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16th February 2015, 09:46 PM #7SENIOR MEMBER
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Thanks, I'll make a few calls/emails tomorrow. Got one reply from an ebay seller but I think I can better his price.
Got all the pieces of metal cut now. The 6 pins are sections of 316 pipe and all machined to within 0.05mm variance in length. They don't need to be any closer, in fact that tolerance is stupid seeing as the next move is to weld them all. But it's easy enough to do on the Chipmaster, so why not.
Kind of fun machining 45mm 316 at 1000 rpm and a .050" DOC. The chips are such a nice shade of red as they peel off of the cutting edge. The lathe doesn't even notice, I could easily double the DOC but I was just getting under the mill scale to make a nice surface for the roller to run on.
PDW
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17th February 2015, 12:45 AM #8New Member
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For your poly pipe search, try the local council. It's a common pipe size for water mains in new estates etc. offcuts are recyclable material. And as a result sometimes turn up at the local tip as well. When you buy it in kilometres of 20m sections, a 3m offcut becomes a throw away item. Well it was for me back when I was laying pipelines.
Damo's dodgy boat building repair shop.
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17th February 2015, 03:17 PM #9GOLD MEMBER
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17th February 2015, 03:53 PM #10New Member
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Oh Shiite. Good luck with that then. Custom job for sure.
Damo's dodgy boat building repair centre.
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17th February 2015, 09:03 PM #11SENIOR MEMBER
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Try a bearing shop ?
Where I live the bearings shops sell various types and diameters of different plastics
Bill
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18th February 2015, 08:49 AM #12SENIOR MEMBER
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Ordered 500mm of the 150mm OD (and yes I did need solid not pipe) from E-Plas in Melbourne. They responded fast, sent a pro-forma invoice with shipping costs, took my credit card details over the phone & emailed me my receipt within an hour of the phone call.
Now to see how long the plastic takes to arrive but that's really out of their hands. I didn't ask for overnight delivery and sometimes Australia Post delivery times to Hobart are a little - slow.
So far though, all the hallmarks of a good vendor. Fast accurate responses to requests for information.
Minimum order was 250mm and cost was a touch over $200/m plus GST. That was half of what an eBay seller quoted me, FWIW. Maybe somewhere else is cheaper, but I was keeping in mind the adage 'good, cheap, fast - pick 2'. I wasn't after the absolute bottom price.
Amazing how seemingly little things like anchor bow rollers start adding up in cost.......
PDW
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19th February 2015, 09:18 PM #13
Thats a good price. I bought an offcut of 150mm acetyl yesterday, i could have bought a 200mm length for $165. I'm going to put that name down for next time.
Cheers1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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27th February 2015, 09:26 PM #14SENIOR MEMBER
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FWIW they shipped fast, well packed. It arrived in under a week. Now there's a chunk of it in the Monarch lathe getting turned into black curly spirals.
It's waaay out of round but as I've never bought this stuff before, no idea if that's what I should expect or not. They gave an approx 20mm over length allowance and the stuff machines very nicely. Cutting it off on the bandsaw was interesting. I knew that blade was blunt as I'd been cutting 316 pipe and bar with it, plus is was far too fine a tooth pitch. After I badly screwed one cut I used a coarse pitch blade in the big vertical bandsaw and that was no drama.
Might actually get to cross a job off of the list soon. There are plenty more.
Speaking of which if anyone has a 3 phase 1/3 to 1/2 HP motor with a high water resistance rating - IP56 or better ideally - I need one for a hydraulic anchor winch project. I want 3 phase so I can feed it from a single phase inverter via VFD for soft start - sailing boats are none too well equipped with big power supplies.
And before anyone asks, yes I can easily mount the pump on my main engine. Have you ever seen what happens to your boat interior when a hydraulic line fails under pressure? Better to have a power pack on the foredeck. Which leads to the other question - why not use 12V DC? Because I hate high current low voltage devices with long cable runs, that's why. I've spent a lot of my life on ships, I'm unfortunately well versed on how things fail.
This is all a bit experimental, depends on finding components. I have quite a lot of hydraulic stuff already though.
PDW
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