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Author Topic: Cutter labeling  (Read 81 times)
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bruce
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« on: December 02, 2017, 05:00:56 PM »

I just recently purchased another set of gear cutters (M0.5) and I have a question about how they are etched-labeled.

Usually I see etched on the side of the cutter not only the Modulus of the cutter (M0.5 in this example) but along
with that a range of teeth the cutter will cut.
This new set i got has an "N" number and each cutter goes from N1 to N8 so I am guessing that correspon ds to the
range of number of teeth for each number.
Can anyone here provide me a chart that shows each N number and the range of cut teeth the cutter can make?
Thank you,
Bruce
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ArtF
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« Reply #1 on: December 02, 2017, 05:21:01 PM »

 I believe its specific to the manufactu rer, I dont think its a specified
standard, but heres a table from newman cutters
 
Range of Cutters for Involute gear cutters

Cutter Number    Cuts Gear from
1    135 teeth to rack
2    55-134
3    35-54
4    26-34
5    21-25
6    17-20
7    14-16
8    12-13

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Art
ArtF
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« Reply #2 on: December 02, 2017, 05:22:17 PM »

by the way, just find the number of the cutter which has a straight line profile,
that will be the 135 tooth to rack cutter...

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Art
bruce
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« Reply #3 on: December 02, 2017, 06:38:57 PM »

TNX the info Art.
I got these cutters on eBay from a seller in Ukraine. I bought 2 sets , a M0.3 (wow tiny gears!) and M0.5
and one set is etched U.S.S.R. They look OK and as far as I can tell never been used.
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ArtF
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« Reply #4 on: December 02, 2017, 09:10:41 PM »

Bruce:

    The ranges I listed are typical, but not always labeled the same,
but if you can rank the cutters from straighte st line profile to most curved,
you will have them ordered in descendin g tooth count ranges..
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Art
bruce
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« Reply #5 on: December 03, 2017, 09:14:09 AM »

Before I had posted this topic here I had sent a message to the seller of these cutters about the labeling.
They replied back after you responded with that list of numbers versus number of teeth and dumb a** me
I should have scrolled down on the listing farther and there was a chart showing cutter number versus range of number of teeth, however;
they show exact opposite, number 1 cutter 12-13 teeth and the list you gave me shows number 1 cutter 135 teeth to rack.
So looks like to confirm all this I will have to look at the cutter profile and determine which cutter has the straighte st profile.
I have another set (M1.0) that shows number of teeth range etched on the cutter it will cut so I can use that as a profile example to compare
with just in case I get confused (which happens often at my age) along the way.
Thanks for the help with this issue.
73's
Bruce
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ArtF
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« Reply #6 on: December 03, 2017, 09:42:24 AM »

Hi Bruce:

  Luckily, you need only find the one with the straight teeth, it will be the highest or lowest number
and is the rack cutter. Glad you have it figured.
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bruce
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« Reply #7 on: December 06, 2017, 09:41:37 AM »

Turns out the chart you show is the opposite to what the cutters actually are, so the chart the seller showed is correct
and I verified by looking at the number 1 and 8 cutters and could see which one was the 135 to rack easily.

I cut some gears a couple of days ago and they look good and very happy with results.

Still having some issues with gearotic between tools and project tabs. I need to watch the tutorial again.
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