Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: JuMpS4 on June 08, 2011, 10:41:30 PM
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hello
I hope I'm in the right area to ask this question I'm new to forums
i'm trying to turn an involute gear tooth cutter with the turn wizard od turn/od fillet
it makes the right to left fillet perfect but i cannot make the left to right fillet to complete the involute shape
anyone feel like helping a newbie i need to fillet from both directions
thanks steve
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Steve,
Can you post a dimensioned sketch of the cutter.
RICH
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Not totaly sure what your plans are so here is some info FWIW.
How i made some gear cutting tools for use with a fly cutter.
http://www.machsupport.com/forum/index.php/topic,8118.msg51321.html#msg51321
http://www.machsupport.com/forum/index.php/topic,8120.msg51325.html#msg51325
Art has created a slick program to generate the code to cut gears on the mill. It is called Gearotic Motion......it's a slick program.
Do an internet search for the site.
Somewhere in here ??? I posted a spread sheet that calculates the dimensions for drawing any gear in CAD.
So what one can do is select a gear and comparitively find the nearest matching radius to make one....great trick for making small gear cutters.
RICH
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hi rich
thank you for your reply
here is a post i found to make a form cutter for the lathe, I was trying to get the fillet wizard to cut the radius's on the shaft. it cuts the right side as your facing it fine but I cannot cut a radius on the left side.
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The txt doc opens in wordpad
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the tool then will be milled and relieved to work like a hob but with just one row of teeth
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I have just started with cnc and I know no g-code I'm using wizards to start with some really good results. I can make this by making the cut in the middle of a longer shaft doing one side then inverting it in the collet and finishing but I would like a way to cut the radius on the left side without removing the shaft from the collet I purchaced both mach and new fangled products I dont know where to update I'm new to forums also so I get
lost easy
thanks for any help
ps nice job on your fly cutters that looked like it worked well too I did them by hand under a magnifyer worked ok
this Idea I have should produce a full set of cutters for however many teeth that will last a long time
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Why not do the forming as shown in the article?
You can generate the code using LazyTurn but you will need to have a dxf file with the profile.
Looking at the turn wizards, seems they only provide for turning the radius on the tail side of the piece.
RICH
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the article would require a tool for every range to be made myway would be so easy i'm off to find a user wizard that will cut a radius from both directions someone else has to have had this come up.
thanks for your fast reply you guys in here are great
I guess I'm going to have to learn lazyturn too ....
good thing this is a hobby they would be cutting my pay if this was my living lol
thanks again
steve
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i'm off to find a user wizard that will cut a radius from both directions
All the Turn wizards that i am aware are listed in the following thread:
http://www.machsupport.com/forum/index.php/topic,17103.msg116309.html#msg116309
Wizard 2 & 16 in the pic Flyout Modified HCIR would probably do the trick but they are modified wizards that need to be tested.
I didn't do the mods and not sure just how far the mods went: ie; they post comments, work in radius and diameter mode, some are new, etc.
If you find something let us know,
RICH
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...I'm off to find a user wizard that will cut a radius from both directions someone else has to have had this come up.
From your description, you are trying to cut a Browne & Sharpe gear cutter (http://www.precisioncuttingtools.co.uk/gifs/pic6.jpg). You are aware, I suppose, that the curve on this is an involute not a circular arc? And that the cutters come in a series of eight, covering 12-rack? And that you have to relieve them radially to give cutting clearance? I think the hardest part of your project will be forming the proper relief.
That said, it is common to approximate the involute with circular arcs.
To answer your specific question, generate the G-code for the outside diameter turning alone (and save it). Generate the G-code for the tailstock end of the cutter and save it. Then open the G-code in an editor and mirror the numbers about the Z-centre of the cutter blank. You can do this easily and manually if you set Z=0 as the blank Z-centre - just negate all the Z-values. There are programs available that will do this for you (e.g. http://www.cnc-syntax-editor.com/).
The only caveat is that your turning tool must be capable of both left- and right-hand working (e.g. a button tool or parting/grooving tool) and you need to set the tool zero at its centre.
Practice on a bit of scrap first!
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thank you
I made the cutter and the gears I needed worked well
steve