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23rd December 2011, 08:50 PM #76Awaiting Email Confirmation
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here are some pics of the tool, notice that there is no back rake as Dave's tool.
a little tricky trying to cut the side rake without loosing height off the cutting tool.
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23rd December 2011 08:50 PM # ADSGoogle Adsense Advertisement
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23rd December 2011, 09:54 PM #77Pink 10EE owner
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I get totally confused bythe terms back rake, side rake, upside down rake etc...
I prefer to use the terms... Cutting edge angle, front clearance angle, side clearance angle, angle on inclination..
Clearance angles are just that, for clearance... Cutting edge angle varies for the material.... MS is around 7-10 degrees.... Angle of inclination is the angle the tool angles back when you look along the cutting edge....The very common square HSS holders have this set at around 15 degrees..Light red, the colour of choice for the discerning man.
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23rd December 2011, 10:11 PM #78Dave J Guest
Lather,
The tool looks good and it looks like you have a have a good eye and steady hand when grinding.
RC,
Just following on the names that are common to every one and have been for many years. If we stick to this, then when people go looking for more info on it, it's all the same terminology.
Dave
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23rd December 2011, 10:29 PM #79Pink 10EE owner
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Dave just going by my tafe book I wonder if the terms side rake and top rake etc are US terms as the tafe book only mentions normal rake which the wedge cutting angle. Normal rake angles are
0 for brass
8-10 for cast iron
10-15 for mild steel
20-25 for copper and aluminium.
Clearanc eangles to be 3-8 degrees... more for aluminium..
Then you have the approach angle andnose radius.
Carbide inserts are different in that they have positive and negative inserts. From what i understand allnthis means is negative inserts have 0 clearance built into the insert and theholder holds them down at a angle. While positive inserts have the clearance angle built in... negative inserts can be double sided and have stronger edges but require more hp for a given cut and are not as good at getting a good surface finish.Light red, the colour of choice for the discerning man.
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23rd December 2011, 10:39 PM #80Awaiting Email Confirmation
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dave, wish i had that steady a hand, used a platform on the grinder which can be tilted which saves a lot of hassle.
for the last edge or side rake, set the platform to the correct angle, then placed another platform on top and angled it until the cutting edge was horizontal to the grinder.
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23rd December 2011, 10:40 PM #81Distracted Member
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I would love to see a consensus on names for tool angles. Every source I see seems different. And every discussion I've seen just gets confusing and resorts to pictures.
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23rd December 2011, 10:54 PM #82Dave J Guest
I just checked and it sounds like we have the same book with the normal rake and those numbers, is it a 3 volume set? I was just referencing mine to the South Bend link I gave to save confusion and is what I call it as well.
Just looking in that book I see they call back rake inclination and the side rake normal rake.
Dave
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23rd December 2011, 10:54 PM #83Awaiting Email Confirmation
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Bryan, your right about that, found this on wiki, when trying to figure out the angles to grind when trying to replicate the angles Dave posted.
File:Tool Bit Geometry.JPG - Wikipedia, the free encyclopedia
makes sense to me.
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23rd December 2011, 10:59 PM #84Dave J Guest
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23rd December 2011, 11:03 PM #85Dave J Guest
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23rd December 2011, 11:07 PM #86
..."as that describes exactly what it is in simple terms."
only if you are used to those simple terms.
To me 'rake' implies at best the angle of the teeth on a garder implement. I'm used to the terms cutting angle or clearance angle. "back rake angle" is only barely meaningful to me. I would consider that more relevant to the angle of the tool holder than the tool edge though.....
A consistent set of tems would be very helpful.
Joe
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23rd December 2011, 11:15 PM #87SENIOR MEMBER
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There might be some confusion in that with cutting tools there is only negative rake and positive rake. Rake is an inclination not an angle. Everything else is cutting and clearance angles.
Phil
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23rd December 2011, 11:25 PM #88Dave J Guest
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