My bride would have no problem explaining the existence of such things:
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RF-45 Mill/Drill Done
- Thread starter Downwindtracker2
- Start date
Downwindtracker2
Well-Known Member
Just a question, are there straight shank ones , instead of the double flats ? I use EG100 collets so I have is plenty of grip for a straight shank.
The Weldon standard includes the two flats. Without them it's not a Weldon. But I'd bet big bucks you can find fakes.
However, I'd also bet you can find straight shank annular cutters. I'll keep an eye open for you.
I was going to comment above about the pattent being expired. The original certainly is.
In the process I discovered the details of the Weldon Shank.
Apparently, the hole is not round, it is slightly elliptical. This works in combination with the screws to yield a concentric mounting for the tool that will not turn in the shank.
So there you have it @CWret !
In the process I discovered the details of the Weldon Shank.
Apparently, the hole is not round, it is slightly elliptical. This works in combination with the screws to yield a concentric mounting for the tool that will not turn in the shank.
So there you have it @CWret !
My understanding of Weldon style toolholder (maybe incorrect) is two-fold: to prevent tool rotation within the holder socket & prevent axial movement. It is possible for cutters to get sucked out of their holders if the conditions are right (or wrong depending on ones perspective). Whether its 80/20 or 50/50 I cant say. These aren't great links but kind of hint at that.
www.ctemag.com
patents.justia.com
Worry free
Courtesy of Haimer USA Hogging 6061-T6 aluminum on a horizontal machining center using a Haimer Safe-Lock-equipped HSK collet chuck. Antipullout toolholders reduce scrap, increase tool life and eliminate anxiety while milling.
www.ctemag.com
US Patent for Shank for a milling tool Patent (Patent # 5,403,134 issued April 4, 1995) - Justia Patents Search
A shank carries a milling tool and has a clamping portion adapted to be mounted in a bore of a chuck. The chuck has first and second locking screws which are engageable with first and second recesses, respectively, formed on a cylindrical outer surface of the clamping portion of the shank. The...
patents.justia.com
Yes I get it. Thanks. I've been doing some homework & I'm starting to understand annular cutters and how they work. The weldon locking screws have a dual purpose to resist the rotational and axial movement of the cutter. IMO the locking screws can stop rotational movement and help reduce axial movement - I'd guess it's 80/20 respectfully.
Rotational - (IMO) - If the cutter rotates in the holder (radial slippage), then the locking screws would tend to tighten against the flat of the weldon (as the gap narrows during initial rotation). This binding of the locking screw would stop any further rotation. The compression (or tightening against the flat) of the tip of the screw increases with initial rotation. The locking screws only have to be snug for this to occur.
Axial - (again a big IMO) - In the case of axial movement, the locking screws could slide (vertically) on the flat surface and only help reduce axial movement. The tighter they are the more axial resistance. ((I deleted the word "actual" from the last sentence), actual axial - try saying that fast twice)).
The locking screws could eliminate axial movement if there was a horizontal grove in the weldon flat so that the locking screws seated into that grove. Then the tip of the locking screw would be in shear and axial movement could only happen if the tip of the locking screw failed (sheared off).
Rotational - (IMO) - If the cutter rotates in the holder (radial slippage), then the locking screws would tend to tighten against the flat of the weldon (as the gap narrows during initial rotation). This binding of the locking screw would stop any further rotation. The compression (or tightening against the flat) of the tip of the screw increases with initial rotation. The locking screws only have to be snug for this to occur.
Axial - (again a big IMO) - In the case of axial movement, the locking screws could slide (vertically) on the flat surface and only help reduce axial movement. The tighter they are the more axial resistance. ((I deleted the word "actual" from the last sentence), actual axial - try saying that fast twice)).
The locking screws could eliminate axial movement if there was a horizontal grove in the weldon flat so that the locking screws seated into that grove. Then the tip of the locking screw would be in shear and axial movement could only happen if the tip of the locking screw failed (sheared off).
Ya, you might be right. Not sure though. It's not ugly simple. I still think eccentricity is the biggest deal. A wobble in the cutters is nothing but hateful!