Author Topic: Frankfurt flea market.... yet AGAIN !  (Read 817 times)

eskoilola

  • Guest
Frankfurt flea market.... yet AGAIN !
« on: February 24, 2018, 10:08:15 AM »
Oh dear. I made it again.

Kebab, sunshine, VERY cold wind and carbide inserts.

Seems I just cannot help myself. About 100 inserts 50 cents a pop. I just grabbed two fistfuls from a insert pile the seller had. Ended up being the proud owner of some really odd bits.

Does anyone know what the inserts in the right are used for ?



Offline PekkaNF

  • Hero Member
  • *****
  • Posts: 1982
  • Country: fi
Re: Frankfurt flea market.... yet AGAIN !
« Reply #1 on: February 24, 2018, 12:20:56 PM »
This is interesting:


Could it be to make multirib belt wheels?

Angle looks more acute than normal 60 degrees for threading. Polyvee has 40 degrees of included angle.
https://cdn.shopify.com/s/files/1/0371/7109/files/poly-v-belt-pulley.pdf?7462402128406206542

Does look a little like this:
http://www.pulse-pr.co.uk/ntk-demonstrates-pulling-power-with-poly-v-line-382.asp

If the "pitch" is 2,34 mm i.e. for J-belt....do you want to sell some?

Pekka
« Last Edit: February 24, 2018, 12:47:45 PM by PekkaNF »

Offline philf

  • Hero Member
  • *****
  • Posts: 845
  • Country: gb
Re: Frankfurt flea market.... yet AGAIN !
« Reply #2 on: February 24, 2018, 02:33:02 PM »
I just measured the angle by copying and pasting the image into Autocad and, as Pekka says, they could well be for poly-v pulley machining as they do seem to be 40 degree.

What is the pitch?

Phil.
Phil Fern
Location: Marple, Cheshire

Offline tom osselton

  • Hero Member
  • *****
  • Posts: 913
  • Country: ca
Re: Frankfurt flea market.... yet AGAIN !
« Reply #3 on: February 24, 2018, 04:05:38 PM »
Nice haul!
On a side note I notice on my old samsung tablet there are 3 colums of pics but only shows two rows on the page

eskoilola

  • Guest
Re: Frankfurt flea market.... yet AGAIN !
« Reply #4 on: February 24, 2018, 08:07:27 PM »
On the side one can read: N-40. NTK
The N-40 is probably the material - so not much of information there.
The distance over 2 teeth is about 7 millimeters, measured with my bad sight and a Mitutoyo caliper. That would make the pitch 3.5 millimeters.



eskoilola

  • Guest
Re: Frankfurt flea market.... yet AGAIN !
« Reply #5 on: February 24, 2018, 08:22:07 PM »
NTK POLY-V

Offline philf

  • Hero Member
  • *****
  • Posts: 845
  • Country: gb
Re: Frankfurt flea market.... yet AGAIN !
« Reply #6 on: February 25, 2018, 03:57:24 AM »
PK size Poly-V is nominally 3.56mm pitch and I'm fairly sure that the 40 in the part number is for 40 degrees.

Phil.
Phil Fern
Location: Marple, Cheshire