9x20/7x10 MT2 Lathe Draw Bar Handle for Collet Holder - Version 2

prusaprinters

<p>This improved version of my previous &nbsp;print is a bit easier to use. The previous version worked, but the handle tended to get a bit jammed into the spindle hole. &nbsp;This new version still fits into the spindle hole, but it has a shoulder which makes tightening and removing the draw bar easier. It's also a bit shorter so is slightly cheaper and faster to print; however this does mean that if you are using it as a replacement for the previous version you will need to shorten the threaded rod.</p><p>I purchased an ER32 collet holder for my lathes. The collet holder fits into the MT2 bore of the lathe spindle, and is threaded 1/2"-13 so that a draw bar can be used to secure it in the spindle. The draw bar is a simple rod threaded at both ends; this rod needs a handle to enable the threaded end to be tightened in the collet. This handle secures the rod in the left end of the spindle bore (see photos). It works on both my 9x20 and 7x10 lathes (although different rod lengths are needed for each lathe).@To use the handle simply add a threaded rod of appropriate length for your lathe, and secure with two 1/2"-13 nuts.@I haven't tried it, but I imagine this print could be scaled to work with metric sizes as well.</p><p>&nbsp;</p><p>The OnShape 3D CAD files for this are here:</p><p><a href="https://cad.onshape.com/documents/60dc422202f6ee029fe0e34c/w/ea294b1bcb3b17139bed6182/e/22e8c6253ea669ac17b87588">https://cad.onshape.com/documents/60dc422202f6ee029fe0e34c/w/ea294b1bcb3b17139bed6182/e/22e8c6253ea669ac17b87588</a></p><p>&nbsp;</p><h4>Printing</h4><p>&nbsp;</p><p>Print in PETG using the 3mf file provided. My previous version was printed in PLA, so that should work also. &nbsp;Important settings:</p><ul><li>20% rectilinear infill</li><li>perimeters = 4</li><li>modifier around the axis to set perimeters = 8 for a “solid center”</li></ul><p>&nbsp;</p>