Pullstart 62,837 #1 Posted November 9, 2022 My hydraulic cylinders have blind/clearance holes in them, then the o-ring block has threaded pipe fittings. I’d like to clock my holes 90 degrees from current state. Other than moving slow, and having a sharp drill bit to reduce the burr buildup, any thoughts on how to smoothly deburr a hole in an 1/8” or so thick sidewall? I’ve thought about a flap style sanding drum on my high speed grinder after drilling, or maybe even a carbide burr and a smooth hand to chamfer the holes. 1 Share this post Link to post Share on other sites
Pullstart 62,837 #2 Posted November 9, 2022 Someone on a forum mentioned clamping the workpiece in the vice, drilling the hole, following with a flap drum. Not a terrible idea! Share this post Link to post Share on other sites
pacer 3,169 #3 Posted November 9, 2022 Flap drum shud do it simply and easily. I've got them from 3/4" up to 3', handy little gadgets. 2 Share this post Link to post Share on other sites
sjoemie himself 3,068 #4 Posted November 9, 2022 (edited) There are special tools for this application. Check out this link and scroll through the pictures, I think you'll get the picture https://superhandig.nl/achterwaartse-ontbramer-voor-boringen-o10-22m-grattec.html Also a dovetail shaped burr in a die grinder should work aswell. Edited November 9, 2022 by sjoemie himself Added picture 1 Share this post Link to post Share on other sites
Pullstart 62,837 #5 Posted November 9, 2022 @sjoemie himself I actually might have some of those dovetail burrs! Great idea! 2 Share this post Link to post Share on other sites
953 nut 55,194 #6 Posted November 9, 2022 I have had a deburring tool like this for several years, works well on drilled holes and saw cut edges. Tips are replaceable. 3 1 Share this post Link to post Share on other sites
Pullstart 62,837 #7 Posted November 9, 2022 10 minutes ago, 953 nut said: I have had a deburring tool like this for several years, works well on drilled holes and saw cut edges. Tips are replaceable. I’ve got one of those too, but I’d like to clean the inside of the tube and don’t know if it would help… 1 Share this post Link to post Share on other sites
953 nut 55,194 #8 Posted November 9, 2022 It can undercut the drilled hole if held at an angle. 1 Share this post Link to post Share on other sites
lynnmor 7,305 #9 Posted November 10, 2022 27 minutes ago, Pullstart said: I’ve got one of those too, but I’d like to clean the inside of the tube and don’t know if it would help… They make internal bits for that type of deburring tool. One example 1 1 Share this post Link to post Share on other sites
ri702bill 8,316 #10 Posted November 10, 2022 10 hours ago, lynnmor said: They make internal bits for that type of deburring tool. One example McMaster has them - the one you may want looks like a hook - E300 style. The flap wheel can leave scratches in the cylinder bore - not good for O-rings,,,,, Bill 1 Share this post Link to post Share on other sites
