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Old 08-01-2020, 05:09 PM
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Default Help me find a end mill

Im looking for a 50 degree dovetail cutter. Needs to be at least 3/4" wide. Will need it to machine my new gib.
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Old 08-01-2020, 05:56 PM
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Cutting a narrow piece a an angle will be pretty difficult. I believe they are surface ground. as well.
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Old 08-01-2020, 06:49 PM
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Originally Posted by milomilo View Post
Cutting a narrow piece a an angle will be pretty difficult. I believe they are surface ground. as well.
Correct. A friend with a shop and the needed skills and equipment has offered to help me out. Just doesn't have the right cutter.
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Old 08-01-2020, 06:59 PM
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That’s not a standard angle for dovetail cutters....45 and 60 are the common ones.

What do you need that for to make the gib?


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Old 08-01-2020, 07:19 PM
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Originally Posted by greywynd View Post
That’s not a standard angle for dovetail cutters....45 and 60 are the common ones.

What do you need that for to make the gib?


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Yup need it for the gib.
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Old 08-01-2020, 09:21 PM
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The term is "dovetail cutter" not end mill. In all the years I've been doing this I've never seen an "over the counter" 50 degree cutter. Not to say they aren't out there but I've never seen one.

A very common angle for some dovetails on some machines was 55 degrees. Once you move away from the standard 45 or 60 degree cutters you need a more accurate way to measure the dovetail because it might be some oddball number. From what I see in the picture your protractor is reading 49 degrees so I wouldn't automatically assume that it's a nice neat 50 degree angle.

Chances are once you determine the correct angle you'll have to have a cutter ground to fit--it's going to be the easiest way. The other option is to tilt the head of the mill to match the angle. Tricky but doable. Personally I'd verify the correct angle and then have a cutter ground...
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Old 08-01-2020, 09:35 PM
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What would be the best way to go about verifying the angle?
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Old 08-01-2020, 09:54 PM
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Here’s one way.

Lay it on a surface plate. Use dowels, drill blanks etc of different diameters against the angled surface.

Measure across to the back side of the gib. Now if you do some trig you can calculate the angle.


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Old 08-02-2020, 02:45 AM
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ORF,
I think I would be looking at tilting the head of the mill to replicate this.

To set the mill I would use the following procedure:

Set the old gib parallel to the long travel of the mill and clamp it down.

Now mount a dial gauge in the spindle of the mill and tilt the head. Use the quill travel to check the angle with the dial gauge.

Machine the angle using a standard parallel endmill.

Working this way you don’t need to actually measure the angle or buy an expensive cutter that will probably not get used again.

Good luck and enjoy the learning experience.

Rob


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  #10  
Old 08-02-2020, 09:19 AM
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If the gib is as beat up as you have said it is I think I'd be taking the angle off of the other parts of the machine.
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