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Thread: Using steel rule and 90-degree tangent for centre height tool setting Quick and easy

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    thehomeengineer's Avatar
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    Using steel rule and 90-degree tangent for centre height tool setting Quick and easy

    Hi All
    I have seen a lot of lathe centre height setting gauges. (which I might add are nicely made) I usually set my tools against the revolving centre or dead centre from the tailstock. If I need to set a tool half way in to a job which is supported by the tailstock I use the following quick fix. I use a steel rule and simply set this between the work piece and the tool to be set. If the rule leans forward the tool is to high and if the rule leans back to low. So, when the rule is upright the tool is on centre height and therefore, the cutting edge must be at a 90-degree tangent to the centre line/height of the machine. Simply and very quick.

    photo showing rule between component and rule

    Using steel rule and 90-degree tangent for centre height tool setting Quick and easy-img_0859.jpg

    Tool to high

    Using steel rule and 90-degree tangent for centre height tool setting Quick and easy-img_0862.jpg

    Tool to low

    Using steel rule and 90-degree tangent for centre height tool setting Quick and easy-img_0861.jpg

    Tool at centre height

    Using steel rule and 90-degree tangent for centre height tool setting Quick and easy-img_0863.jpg


    Thank you for viewing
    The Home Engineer

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    Thanks thehomeengineer! We've added your Tool Height Setting Method to our Measuring and Marking category,
    as well as to your builder page: thehomeengineer's Homemade Tools. Your receipt:




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    I remember once seeing an old toolmaker doing this on a drill press, I said why are you doing that, he said finding the centre of the bar.
    I said how accurate is that going to be? a couple of thou came the reply, and it was.
    We should not forget these old tricks, thanks for posting.

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    PJs
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    Quote Originally Posted by olderdan View Post
    I remember once seeing an old toolmaker doing this on a drill press, I said why are you doing that, he said finding the centre of the bar.
    I said how accurate is that going to be? a couple of thou came the reply, and it was.
    We should not forget these old tricks, thanks for posting.
    Roger that! That is the way I was taught way back when. The only thing I do different is use about 3-5 thou feeler gauge I keep in the drawer. I found using a scale the tool bit would get caught in the engraving and throw me off.

    Thanks for posting this The Home Engineer.

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    Thumbs up Congratulations

    Quote Originally Posted by thehomeengineer View Post
    Hi All
    I have seen a lot of lathe centre height setting gauges. (which I might add are nicely made) I usually set my tools against the revolving centre or dead centre from the tailstock. If I need to set a tool half way in to a job which is supported by the tailstock I use the following quick fix. I use a steel rule and simply set this between the work piece and the tool to be set. If the rule leans forward the tool is to high and if the rule leans back to low. So, when the rule is upright the tool is on centre height and therefore, the cutting edge must be at a 90-degree tangent to the centre line/height of the machine. Simply and very quick.

    photo showing rule between component and rule

    Click image for larger version. 

Name:	IMG_0859.JPG 
Views:	157 
Size:	93.5 KB 
ID:	22297

    Tool to high

    Click image for larger version. 

Name:	IMG_0862.JPG 
Views:	138 
Size:	104.3 KB 
ID:	22298

    Tool to low

    Click image for larger version. 

Name:	IMG_0861.JPG 
Views:	137 
Size:	93.4 KB 
ID:	22299

    Tool at centre height

    Click image for larger version. 

Name:	IMG_0863.JPG 
Views:	131 
Size:	106.9 KB 
ID:	22300


    Thank you for viewing
    The Home Engineer
    Congratulations
    Finally, Someone has remembered the simplest and possibly best method of locating a lathe tool on center.
    I have quite enjoyed all the clamor of building "Hight Gages" to do the job when the absolute simplest and best method of locating was using a thin flat piece of metal against the work or something on the lathe that is always on the vertical center.
    An OLD Tool Maker
    Jon

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    mklotz mklotz's Avatar
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    Quote Originally Posted by Jonny View Post
    Congratulations
    Finally, Someone has remembered the simplest and possibly best method of locating a lathe tool on center.
    I have quite enjoyed all the clamor of building "Hight Gages" to do the job when the absolute simplest and best method of locating was using a thin flat piece of metal against the work or something on the lathe that is always on the vertical center.
    An OLD Tool Maker
    Jon
    I might point out that it may be OK for setting tools used on the exterior of the workpiece but it isn't very useful for setting boring bars.
    ---
    Regards, Marv


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    Hi Marv
    I simply move the tool to the opposite side of the workpiece and set the boring tool in the same way on the outer diameter. If using a boring bar it is highly unlikely that you would be using a centre to support the work piece.
    The Home Engineer


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