Re: [Healeys] Holes in Painted Surface

[warthodson@aol.com]

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If I want to drill thru sheet metal I use one of the stepped, cone shaped 
"unibits". They make much better, rounder holes than standard drill bits in 
sheet metal. I would buy a new one if I was drilling thru a painted surface. If 
you have never used one, I suggest  drilling a few test holes in a similar 
thickness piece of scrap sheet metal, just to get the feel of using it. Also, 
when drilling it is not always obvious which step is the correct step to stop 
the drilling. So, I put a clear mark on the step with a felt tip marker before 
starting to drill. 
Gary Hodson  
 
 
-----Original Message-----
From: Bob Spidell <bspidell@comcast.net>
To: Michael MacLean <rrengineer.mike@att.net>; Healeys Help 
<healeys@autox.team.net>
Sent: Tue, Apr 12, 2016 8:19 am
Subject: Re: [Healeys] Holes in Painted Surface


    I suspect it would depend on type of material, type of paint,    condition 
of both, etc. but have always assumed applying some kind    of 
tape--electrical, masking, etc.--over and under--if the    underneath is 
painted, too--the area to be drilled is about all you    can do to prevent 
chipping.  Make sure you use a sharp bit, and a    variable speed drill so you 
can start slow to drill through the    paint.
    
    Begs the question: do you use a punch to 'prime' the hole--with or    
without tape--before drilling?
    
    Bob
    
    
On 4/12/2016 12:29 AM, Michael MacLean      wrote:
    
    
      
        
What's the best          way to drill holes in a painted surface?
        
Mike MacLean
        
      
      
    
    
  
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<font color='black' size='2' face='arial'>
<div>If I&nbsp;want to drill&nbsp;thru sheet metal I use one of the stepped, 
cone shaped "unibits". They make much better, rounder holes than standard drill 
bits in sheet metal. I would buy a new one if I was drilling thru a painted 
surface. If you have never used one, I suggest&nbsp; drilling a few test holes 
in a similar thickness piece of scrap sheet metal, just to get the feel of 
using it. Also, when drilling it is not always obvious which step is the 
correct step to stop the drilling. So, I put a clear mark on the step with a 
felt tip marker before starting to drill. </div>

<div>Gary Hodson&nbsp;&nbsp;</div>

<div>&nbsp;</div>

<div>&nbsp;</div>

<div style="color: black; font-family: arial,helvetica; font-size: 
10pt;">-----Original Message-----<br>
From: Bob Spidell &lt;bspidell@comcast.net&gt;<br>
To: Michael MacLean &lt;rrengineer.mike@att.net&gt;; Healeys Help 
&lt;healeys@autox.team.net&gt;<br>
Sent: Tue, Apr 12, 2016 8:19 am<br>
Subject: Re: [Healeys] Holes in Painted Surface<br>
<br>


<div id="AOLMsgPart_1.2_9d2c87d3-a9f2-41be-b499-df1e2bf23fd8">

<div class="aolReplacedBody" text="#000000" bgcolor="#FFFFFF">
    I suspect it would depend on type of material, type of paint,
    condition of both, etc. but have always assumed applying some kind
    of tape--electrical, masking, etc.--over and under--if the
    underneath is painted, too--the area to be drilled is about all you
    can do to prevent chipping.&nbsp; Make sure you use a sharp bit, and a
    variable speed drill so you can start slow to drill through the
    paint.<br>

    <br>

    Begs the question: do you use a punch to 'prime' the hole--with or
    without tape--before drilling?<br>

    <br>

    Bob<br>

    <br>

    
<div class="moz-cite-prefix">On 4/12/2016 12:29 AM, Michael MacLean
      wrote:<br>

    </div>

    <blockquote cite="about:blank">
      
<div style="color: rgb(0, 0, 0); font-family: times new roman, new york, times, 
serif; font-size: 16px; background-color: rgb(255, 255, 255);">
        
<div id="yui_3_16_0_ym19_1_1460445982370_18849">What's the best
          way to drill holes in a painted surface?</div>

        
<div dir="ltr">Mike MacLean<br>

        </div>

      </div>

      <br>

    </blockquote>
    <br>

  

</div>

</div>

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