<div dir="ltr">A proper "reamer" has straight vertical cutting (not scraping) flutes. What is commonly referred to here as "reaming" is correctly known as "chasing", where one runs a drill <b><u><i>bit</i></u></b> (a <b><u><i>drill</i></u></b> is a tool that turns a bit) slightly larger than the initial hole to "chase it" out.<div> <br></div><div style>Paul Bruesch</div><div style>Stillwater, MN</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Mar 7, 2013 at 2:16 PM, Jim Ialeggio <span dir="ltr"><<a href="mailto:jim@grandpianosolutions.com" target="_blank">jim@grandpianosolutions.com</a>></span> wrote:<br> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Ed Foot wrote:<br> <br> <I have made my own pinblock reamers from bits in which I grind away all the cutting edges for the first inch or so of the bit. It makes for an accurate pilot without chewing a<br> sideways hole on the way in.<br> <br> This is interesting and makes a lot of sense.<br> <br> So, what exactly is the cutting action of a reamer? Is is simply a scraping action? If so, what keeps the 1st hole's wall fibres from just bending over rather than actually being sheared off ?<span class="HOEnZb"><font color="#888888"><br> <br> Jim Ialeggio<br> <br> -- <br> Jim Ialeggio <br> <a href="mailto:jim@grandpianosolutions.com" target="_blank">jim@grandpianosolutions.com</a><br> <a href="tel:978%20425-9026" value="+19784259026" target="_blank">978 425-9026</a><br> Shirley Center, MA<br> <br> </font></span></blockquote></div><br></div>