slit saw jams

[Anonymous]

Posted by Iain Downs on 04/11/2017 07:06:32:

Thirdly, I have managed deep cuts with slitting saws on this mill. It gives a lovely almost mirror finish much better than the mill…………………

Hmmmm, I've never achieved that sort of finish with a slitting saw. A nicely machined surface yes, but not a mirror finish. To me that implies that the slitting saw is doing as much rubbing as cutting.

For what it's worth I've never managed a deep cut with a slitting saw on the Bridgeport without said saw going walkies. On the horizontal mill it's a different matter, much more rigid.

Andrew

[SillyOldDufferModerator @sillyoldduffer]

When drilling or sawing at an angle I find it helps to cut a notch so the cut starts at a right angle to the face.

Notch greatly exaggerated for clarity! In Iain's place I would cut a shallow notch with an end-mill before applying the saw.

Iain's point about saws producing a good finish is a good one; another reason would be to make two fitting parts by cutting across a single blank.

Dave

 

Edited By SillyOldDuffer on 04/11/2017 08:58:23

[HOWARDTParticipant @howardt]

One other possible cause is that the cutting edges on each face of the saw can quickly get blunted and become round. Have a look at the edges under an eye glass. It can be quite a revelation as to how rounded they are.

[David Standing 1Participant @davidstanding1]

So I read "I'm cutting off about 1mm"

Then I saw some of the responses.

Then I read "Depth of cut 1mm"

Then I saw the diagram.

Then I saw some more responses.

Then I thought:

"Send three and fourpence, I'm going to a dance".

Some of you will instantly understand where I am coming from.

It always amazes me how many threads there are on here where there is something unclear posted, there is much guessing and misjudgement as to what is being said because it isn't clear, then at last on about page two the original intent finally comes out, along with some – now – useful suggestions!

 

 

 

Edited By David Standing 1 on 04/11/2017 09:58:59

[ASFParticipant @asf]

I avoid using slitting saws if i can. To use one in this instance would be a no-no. I would rather create a quickly formed pile of swarf with a milling cutter than slowly passing a blade through a solid piece of steel like that.

[Iain DownsParticipant @iaindowns78295]

My Wine Arm has in fact survived the exercise. Which I did do in two parts taking a breather in between.

I milled the big end clean with a new 4 flute 10mm carbide end mill I picked up at the midlands show. Absolutely brilliant finish.

I'm struggling to see how to hold the small end accurately, so I've cleaned it up the old fashioned way with a file.

I shall post a picture of the clamp a bit later on when I've finished. Sadly I now have to cut right the way across the bar to separate it. No slit saw this time!

Iain

[Iain DownsParticipant @iaindowns78295]

This is what all the fuss was about. After a design by Harold Hall! 45 deg eventually cut with hacksaw and the bigger end cleaned up with mill. Short end cleaned up with elbow grease and file. Appears to slide nicely so I have no further plans to lap or other wise process.

Iain

[Michael GilliganParticipant @michaelgilligan61133]

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