Poly-V carbide/ceramic grooving inserts?

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internetscooter
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Poly-V carbide/ceramic grooving inserts?

Post by internetscooter » Wed Jul 24, 2013 6:10 pm

Quick question -

At some stage in the very near future I have to make up a custom Poly-v pulley ;)

Does anyone know where I can get single Poly-V carbide/ceramic grooving inserts in Australia or online?

This is what I am trying for:

Image

But they are in the UK and only sell 10 at a time (though I am still trying). An alternative would be a single point tool.

This is to match the Rotrex:

Image

Cheers,
Paul
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RGV
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Re: Poly-V carbide/ceramic grooving inserts?

Post by RGV » Wed Jul 24, 2013 8:08 pm

So thats how they make them. Sorry cant help Paul.

Dave

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Re: Poly-V carbide/ceramic grooving inserts?

Post by JonB » Fri Jul 26, 2013 1:58 pm

No real help but standard thread cutting inserts won't work, UNC, UNF and Metric threads are 60 degrees and the Pommy stuff is 55 degrees.
Shouldn't be too hard to grind up a pice of tool steel, just have to dress the convex radiuses by hand.
Odd pitch spacing, doesn't equal an imperial measurement either.
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Re: Poly-V carbide/ceramic grooving inserts?

Post by internetscooter » Fri Jul 26, 2013 2:26 pm

Thanks - I have since found the Tool Flo also produce a carbide insert http://www.toolflo.com/cats/Automotive.pdf (the one above is NTK).

No response to my email as yet but I will give them a call.

I will hunt for another week and then go down the DIY path. I have some example pulleys now and that will help :)
Paul
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Re: Poly-V carbide/ceramic grooving inserts?

Post by gravmax88 » Sat Jul 27, 2013 12:01 am

Grind up a bit of tool steel to fit the sample pulleys that you have......Made quite a few pulleys both alloy and steel 25 years ago, the belts are really quite tolerant to minor sizing variations......

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Re: Poly-V carbide/ceramic grooving inserts?

Post by internetscooter » Sat Jul 27, 2013 8:28 am

gravmax88 wrote:Grind up a bit of tool steel to fit the sample pulleys that you have......Made quite a few pulleys both alloy and steel 25 years ago, the belts are really quite tolerant to minor sizing variations......

Graham
Thanks Graham - I was trying to get my head around how I would make a radius point of 0.42 mm with an accuracy of +/- 0.05 mm - I guess if it turns it turns ;)

I got a response from Toolflo and they have pointed me to a local distributor - I'll update the thread next week on the result.

Cheers,
Paul
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Re: Poly-V carbide/ceramic grooving inserts?

Post by internetscooter » Sat Jul 27, 2013 8:46 am

Ah - an I have been pinging JP Afflick has he had the same problem - he hasn't been posting pics here because he couldn't work out how to show facebook images....

well here's how you do it :)

Use the graph API and construct a link like this (teh API is a different facebook provided website https://graph.facebook.com)

Code: Select all

https://graph.facebook.com/<picture unique id>/picture
The <picture unique id> is the picture number you see in the standard web address you see at the top of your browser and is AFTER ...?fbid= and BEFORE all the extra bits at the end (i.e. stop when you hit a letter,=,or non-numerical character "&set=np....")

e.g. https://www.facebook.com/photo.php?fbid ... 4559227800[/b][/u]&set=np.255096894.760405549&type=1&theater&notif_t=notify_me

Then add that to an img tag

Code: Select all

[img]https://graph.facebook.com/508574559227800/picture[/img]
Voila - JP's recent exploits ;) You can start your build diary now :)

Image

Hopefully everyone can see this and it is not just me because I happen to be logged into facebook.
Paul
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Re: Poly-V carbide/ceramic grooving inserts?

Post by RGV » Sat Jul 27, 2013 2:00 pm

Yep I see it Paul

Dave

Last Minute Racing "its a 2-stroke ya twit - Its supposed to smoke"
DLRA #928
SATA #10

2010 MPS/G 250 118 MPH:)
2011 Washed Out:(
2012 Washed Out:(
2013 MPS/G 250 131 MPH (RECORD):)
2014 MPS/G 250 140 MPH (RECORD):)
2015 MPS/F 250 DNF:(

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Re: Poly-V carbide/ceramic grooving inserts?

Post by JonB » Sun Jul 28, 2013 1:09 pm

I can see it and don't have a Facebook account so should be ok for everyone.
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Re: Poly-V carbide/ceramic grooving inserts?

Post by Stayt`ie » Sun Jul 28, 2013 1:35 pm

i cant see enough of those calculations, :mrgreen:
First Australian to ride a motorcycle over 200mph at Bonneville,,,

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Re: Poly-V carbide/ceramic grooving inserts?

Post by gravmax88 » Mon Jul 29, 2013 10:13 am

Here is a pic of homemade pulleys for the micro-V belts.......
They were made to take a 12 row belt, but in the end I used 3 x 4 row belts side by side (just get them from the same batch....read the numbers on the rear of the belts.

The 3 belts lasted better than the single wider belt. It was a GM 2/71 supercharger on top of a Subaru Brumby motor in a drag bike.....8.82 @ 152mph back in '92

Just be sure you engineer a good tensioner roller that gives you plenty of wrap around the pulleys (300 degrees is good if you can get it)

Image


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Re: Poly-V carbide/ceramic grooving inserts?

Post by internetscooter » Mon Jul 29, 2013 8:38 pm

Yes leaving room for a tensioner :)

I have just found the final solution (I think). I have just ordered the 6 rib Toolflo insert for $120 from http://www.mapal.com.au/

Image

It is expensive but fortunately expensive enough that they sell them in ones (any cheaper and I would probably have to buy 10 - though I wouldn't). The tool holder was way too expensive though and not suited to my lathe so I am going to have to make that. I will be making at least 4 pulleys to start with and will be integrating one into the flywheel which will be particularly tricky - so $120 is worth it ($5 per groove).

For anyone else finding this thread, I have also found 40 degree tools on eBay in the UK http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... TQ:GB:1123. Pretty cheap (~$10) but the postage is expensive (though you could convince your UK reli's they are great Xmas gifts).

Image

There was also a 40 degree tool at this link but you could only buy 10 at a time and I wasn't sure if the 40 degrees was actually where I wanted it
http://www.carbideanddiamondtooling.com ... 16.370.883

Image

OK I have the plan and things in the post - I'll post the pulley process as I go :)
Paul
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89.664 mph (aiming for 100mph+)
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Re: Poly-V carbide/ceramic grooving inserts?

Post by raman » Wed Aug 07, 2013 12:20 pm

Dear friends,

I have developed this insert in china and if you want I can sell you at very good price also we have 3 groove and 5 groove also we have developed sphx series in china at very competitive price. please send me email at raman_2007@hotmail.com

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Re: Poly-V carbide/ceramic grooving inserts?

Post by internetscooter » Wed Aug 28, 2013 8:36 am

I have the insert and at the very least I will be using it as a chaser :)

The only reason I have been quiet on the build diary is that the lathe died :( Hopefully it is just a simple NVR switch replacement to fix (part on the way).
Paul
---
DLRA #647
89.664 mph (aiming for 100mph+)
Vespa Labs [url]http://www.vespalabs.org[/url]

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