Moderators dtel Posted October 19, 2020 Moderators Share Posted October 19, 2020 20 minutes ago, Edgar said: Maybe they've gone up significantly in price. I haven't had to buy any in a while. Well it seemed like it if it's replaced when it gets dull, also with so many already I hated to buy a new one. On wood they last a good while on metal not as much of a life span at all. Never had a sharpener before, it's the reason I had so many dull drills bits. 1 Quote Link to comment Share on other sites More sharing options...
Edgar Posted October 19, 2020 Share Posted October 19, 2020 You know, my father left me a whole drawer full of high-speed steel bits when he died ... every last one of them too dull to even drill cream cheese. Maybe one of those sharpeners might be a good idea after all. 1 Quote Link to comment Share on other sites More sharing options...
Ceptorman Posted October 19, 2020 Share Posted October 19, 2020 37 minutes ago, Edgar said: You know, my father left me a whole drawer full of high-speed steel bits when he died ... every last one of them too dull to even drill cream cheese. Maybe one of those sharpeners might be a good idea after all. I'll bet your father's bits are made of better material than most of the new ones. 1 Quote Link to comment Share on other sites More sharing options...
Woofers and Tweeters Posted October 20, 2020 Share Posted October 20, 2020 1 hour ago, dtel said: On wood they last a good while on metal not as much of a life span at all. You might already know, but...for those who don't know, and wants to know about what speed to drill into mild steel: N = 12 * V / Pi * D Where N = desired RPM V = Velocity in feet per minute Pi = 3.141592.... D = Diameter (of either the drill bit, mill cutter, work piece chucked in the lathe, etc) HSS = ~ 72 fpm (cutting into mild steel that is not so thin that it can't carry the heat away (Ex: sheet metal) Carbide can safely stand 3x that speed EX: What speed to turn for machining mild steel using 1/2" HSS bit (0.500")? N = 12 * 72 / 3.14 * .5 N = 550 RPM ^^^^^^^Now, don't worry about remembering ANY of that ^^^^^^^^^^ Put in your pocket that 1/2" HSS bit (0.500") can, generally, turn 500 RPM in mild steel (.500 = 500) Doubling the diameter, drop the RPM in half (Ex: 1" bit = 250 RPM, 2" = 125 RPM, etc...) Double the RPM for what's half the diameter (Ex: 1/4" bit = 1,000 RPM, 1/8" = 2,000 RPM, etc...) 1 1 Quote Link to comment Share on other sites More sharing options...
Edgar Posted October 20, 2020 Share Posted October 20, 2020 18 minutes ago, Woofers and Tweeters said: HSS = ~ 72 fpm (cutting into mild steel that is not so thin that it can't carry the heat away (Ex: sheet metal) Carbide can safely stand 3x that speed Is that with or without coolant? I always use light oil when drilling steel. Quote Link to comment Share on other sites More sharing options...
Woofers and Tweeters Posted October 20, 2020 Share Posted October 20, 2020 4 minutes ago, Edgar said: Is that with or without coolant? I always use light oil when drilling steel. without Types of coolant, chip load, different metals, etc changes everything... sometime small changes, sometimes large changes. Most don't need to know much more than the easy rule of 500 = 500 because it's easy to use for whatever size...3/8, 3/4, etc 2 Quote Link to comment Share on other sites More sharing options...
Dave1290 Posted October 20, 2020 Share Posted October 20, 2020 1 5 Quote Link to comment Share on other sites More sharing options...
DizRotus Posted October 20, 2020 Share Posted October 20, 2020 He might be one of those blind persons who uses echo location. 2 Quote Link to comment Share on other sites More sharing options...
Moderators dtel Posted October 20, 2020 Moderators Share Posted October 20, 2020 2 hours ago, Edgar said: You know, my father left me a whole drawer full of high-speed steel bits when he died ... every last one of them too dull to even drill cream cheese. Maybe one of those sharpeners might be a good idea after all. That's exactly how I ended up with so many, but when I went to use one I would pick out 3 the same size hoping to get one to work. The sharpener works quick adjust the bit in the holder, put in machine and spin until it stops making a sharpening/ grinding sound, less than 30 seconds, just a guess, probably way less. 1 hour ago, Woofers and Tweeters said: You might already know NO I didn't, I knew there was proper speed but had no idea what it was or how to figure it out. Probably why my drill press has 4 different pulleys....duh, I left it where my dad had it 1 Quote Link to comment Share on other sites More sharing options...
moray james Posted October 20, 2020 Share Posted October 20, 2020 48 minutes ago, DizRotus said: He might be one of those blind persons who uses echo location. I'd like to say he probably just uses his stick to find his way around. There is the long one for walking and a smaller one for up close use. He may also have some limited vision. My ex without her corrective lenses she was certified blind. With her glasses on she could read a license plate out on the highway when I could not even see if there was a front plate on the car at all and back then I had just better than 20/20 vision. Just happy for the guy in that photo being able to enjoy his limited vision. 2 1 Quote Link to comment Share on other sites More sharing options...
Moderators dtel Posted October 20, 2020 Moderators Share Posted October 20, 2020 27 minutes ago, moray james said: I'd like to say he probably just uses his stick to find his way around. Typical male. 1 3 Quote Link to comment Share on other sites More sharing options...
Moderators dtel Posted October 21, 2020 Moderators Share Posted October 21, 2020 2 3 Quote Link to comment Share on other sites More sharing options...
Dave1290 Posted October 21, 2020 Share Posted October 21, 2020 Stopping for fuzzy dice??? 1 Quote Link to comment Share on other sites More sharing options...
Moderators dtel Posted October 22, 2020 Moderators Share Posted October 22, 2020 1 hour ago, Dave1290 said: Stopping for fuzzy dice??? WAX 1 Quote Link to comment Share on other sites More sharing options...
babadono Posted October 22, 2020 Share Posted October 22, 2020 Sure that'll rub out.... 2 Quote Link to comment Share on other sites More sharing options...
Edgar Posted October 22, 2020 Share Posted October 22, 2020 20 minutes ago, babadono said: Can I give you a Hundred thousand "thank yous"? For an obvious false-equivalence? 1 Quote Link to comment Share on other sites More sharing options...
Dave1290 Posted October 22, 2020 Share Posted October 22, 2020 1 Quote Link to comment Share on other sites More sharing options...
Islander Posted October 22, 2020 Share Posted October 22, 2020 1 hour ago, Dave1290 said: Stopping for fuzzy dice??? That looks like “the Shitmobile” from “Trailer Park Boys”. The exact car. 3 2 Quote Link to comment Share on other sites More sharing options...
TasDom Posted October 22, 2020 Share Posted October 22, 2020 2 hours ago, Dave1290 said: Stopping for fuzzy dice??? New car smell air freshener. 1 1 1 Quote Link to comment Share on other sites More sharing options...
Seadog Posted October 22, 2020 Share Posted October 22, 2020 3 hours ago, Dave1290 said: Stopping for fuzzy dice??? A can of r-134a to recharge the A/C system? 1 1 Quote Link to comment Share on other sites More sharing options...
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