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  1. #1
    Join Date
    Nov 2008
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    Default Tooling Review - An Inexpensive Chamfer Cutter from Shanghai

    45 degrees centering chamfering cutter HOLDER SSP C20-20-120L +TCMT16T304 | eBay

    I had been thinking that it would be quite convenient to have a 45 degree cutter that I could mount in a collet chuck rather than the arbor mounted cutters I have used so far. There are numerous offerings on eBay and I thought I would take a punt on one from the seller Jay Zhou. I have purchased a number of toolholders from Jay Zhou and most are OK. ( Not all, I have come unstuck with a maybe too cheap parting off tool. Might be worth another review.)

    I used a scrap of 4140 for the test piece. The spindle speed was approximately 950 rpm and I used the mill's slowest table feed, 11mm per minute. The as supplied insert did not provide a flash finish ( second photo below). The Kennametal insert with a 2mm depth of cut produced a reasonable finish in my humble opinion.

    Not too bad for just under twenty bucks. It should prove handy.

    Bob.
    Attached Images Attached Images

  2. #2
    Join Date
    Apr 2009
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    Ballina N.S.W.
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    Default

    Hi BT,
    Have you tried running the cutter a fair bit faster with a slightly less depth of cut. I have a 32 mm diameter 45 degree cutter with two inserts and get the best results running it at 1600 rpm and a 1mm depth of cut and vary the feed rate to suit different materials and end up with an almost polished surface. Your cutter is a lot smaller in diameter so surface speed is well down and it looks like from your pictures it is leaving step marks.
    Bob

  3. #3
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    Hi Bob,

    Heeding your advice, I had another go, though unfortunately I have mislaid the 4140 sample in the midden I call a shed.

    The cutter needs reasonably careful positioning in relation to the workpiece to avoid the back of the insert cutting a step -

    DSC_7841 (Large).JPGDSC_7847 (Large).JPGDSC_7846 (Large).JPG

    The first test was on some 4E cast iron. The first cut at 700 rpm and about 3mm deep. Same 11mm/min feed as yesterday. I thought the finish looked OK-ish. Then I increased the spindle speed to 1600 rpm with about 0.5mm DOC and the finish was improved. There appears to be some chatter.

    DSC_7854 (Large).jpg

    Then I had a go with a piece of 1020. I reckon the finish is better with a spindle speed of 700 rpm, the initial cut on the left hand side, than the 1600 rpm cut on the right.

    DSC_7870 (Large).jpg

    BT

  4. #4
    Join Date
    Apr 2012
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    Healesville
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    Hi BT, if you attack that cutter shaft with a hacksaw you might get a bit less vibration and a bit more Z.

    cheers, shed

  5. #5
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    Quote Originally Posted by shedhappens View Post
    Hi BT, if you attack that cutter shaft with a hacksaw you might get a bit less vibration and a bit more Z.

    cheers, shed
    Something like this Shed?

    DSC_7195 (Large).jpg DSC_7208 (Large).jpg DSC_7214 (Large).jpg

  6. #6
    Join Date
    Apr 2009
    Location
    Ballina N.S.W.
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    Hi Bob,
    I did not realise how long that shank is/was on your cutter. Shank has the idea.When you shorten that tool as you have shown, I am sure you will get rid of that chatter. Here are a few pictures of my cutter it has a 20 mm dia shank and as you can see by the marks on it I run it as short as possible. Good luck.
    Bob
    Attached Images Attached Images

  7. #7
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    Apr 2012
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    Healesville
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    Quote Originally Posted by Anorak Bob View Post
    Something like this Shed?
    Nah, that's not what I was thinking Bob, my thought was to shorten the shaft to get the cutter closer to your collet chuck to make it a bit more
    rigid, didn't think you would reduce the dia.
    Have you spat chips with it yet ?

    cheers, shed

  8. #8
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    Bob and Shed,

    My anorexic example is probably a touch extreme. That boring bar was thinned from 20 to 10mm and the shank reduced in length to about 28mm to fit my boring head. I was thinking of maybe 12mm to suit my largest direct fit 30 taper collet which sits pretty much flush with the spindle nose and the ER20 chuck on the mill's high speed head. It would also fit my lathe's tailstock chuck.

    Or I could just do as Shed suggests and trim off the overhang. And Shed, the only chip spitting has been on the test pieces.

    Bob.

  9. #9
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    Default

    Your a man with a plan Bob, that makes sense to make it more versatile.

  10. #10
    Join Date
    Dec 2013
    Location
    Sydney
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    Quote Originally Posted by Anorak Bob View Post
    ..... in the midden I call a shed.
    BT
    I nearly coughed up my cup of tea when I read this, it perfectly describes my workshop too.

    Graham.

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