Precision Toolmaking Making an Edgefinder Part 1

all right so we're doing some heat treatment tonight got my little electric furnace out and one of the heavier parts in there right now I'm going to put the lighter part in this was magnetized so I needed to demagnetize it a little bit because it was wanting to tip over and I put it in there so we're just going to be heat treating an atmosphere which means the atmosphere in the furnace so we're going to warm these up we're let them equal eyes at twelve hundred and fifty degrees F and then we'll bring them up to the heat treat temperature and in this case is 1550 Fahrenheit this is 50 to 100 steel here same stuff they make ball bearings in gauge blocks and things like that out of and then we're going to do an oil quench and then we'll temper it so should be some fun all right guys this thing's been soaking at 1550 for about 9 out of 20 minutes or so so we got our quench oil here this is a special oil that has a kind of a engineered quenching rate and so I'm going to open this up and grab one of the parts and and quench it and do the few the other ones so here we go do the little one first here when you see I'm educating it and that's to keep bubbles from forming around the around the part and so that the oil gets to it it's probably okay we'll set that one aside there clean the players otherwise they'll smoke out when I reach in there so that's that's dead hard now we have to temper here after this so all right turn this way down so the vessel slightly warm now because it's the oils absorb the heat from the part okay oh yeah scaly writer there it's still a little bit warm so that I don't care about the scale in this case because all these surfaces are going to get ground so it doesn't make any difference for for this situation okay so we've started the tempering cycle now I'm going to temper it 400 degrees F and we're going to leave it in there about two hours then we'll air cool so the next two hours a video will be very boring just kidding alright guys I'll let you in on my little secret project we were doing the heat treating a little while ago well here's the here's the parts okay and so I you know I'd be blasted them to remove all the scalese and stuff off of it then I checked the Rockwell hardness and they're about 60 Rockwell right now what this is is this is a custom edge finder okay so I'm calling this a a Narwhal or a Pinocchio or let's see ant eater or you know some kind of long nose a creature so the idea here is that with a small diameter tip we can reach large diameter rounds in the milling machine I saw one like that somebody had made years and years ago and I always wanted to try making one and lapping those surfaces and doing all that so that's what we're doing and there's the bits okay so we're going to start with the this big part okay and we get the whirligig here okay and so I think what we're going to do first is we're going to grind this this diameter here concentric with that and go from there so let me get this set up and I'll come back in a second I'll show you how you dial this in and and then we'll do a little cylindrical grinding on the surface grinder okay so we're adjusting this to get it concentric I want to do the shank that way when I turn it around I don't have to there's grinding stock on both of these diameters but I'm going to dial it in on that one I'll grind that one and then I'll flip it around and grind the small diameter okay so you can probably see the indicators whipping around there so now you guys can see this okay you see this little screw right here we adjust that little screw it up moves the Vblock up and down it's on a little rack and pinion it's very it's a very slick setup so let's see where are we here flip it 180 okay so we're falling off so I'm going to go the other way let's scoops too much so when you get down into fine adjustments whoo pretty good first Rider and that may be as close as we can kind of practically get it here this is a tense indicator here and see if I can get a little closer check it side to side it just says good flip it around so yeah it's about 2/10 side to side okay and then it's pretty damn good you know what I let's see so that sides whoa it's gonna come up okay you gotta think about Luke's yeah see sometimes it's difficult to make a real small real small adjustment like this Creek great alright while you chase your tail sometimes oh there we go alright you know what I'm going to call that okay here for this this is the first initial grind so now the the Vblock has a locking screw it's preloaded with a big spring in there so it's up tight against the rotating part so we can get this dang thing in there and use one of these in a while so alright there we go of course and you're doing this all up on the deck of the surface grinder so I want to leave the indicator on it so come on there we go give it me okay so it should be nice and tight let's give it a little spin check okay so if you tense 310 something like that okay alright so I'm pretty happy with that and we'll come up and we'll dust off that diameter let's go for it okay so we're kind of ready to go here the wheels been trued and dressed it's got a fine dress on it so that I'm looking for good surface finish here you come up and check out here you catch up and the scare it is on that touch off because I don't know how wonky that is to put a motor on this little thinner here pretty good so take a little while and down fetus half an hour so you guys are like this when I get a little mirror here so you can kind of see it from this other angle which is kind of cool so it's to give it a little down feed here kind of neat I can see it in the mirror my job looks like we're growing all the way around now let's talk about us how to clean that up we'll take a measurement after this pass yeah I can see in the Vblock when I excuse me and then there when I'm getting close to the Vblock where oh yeah get away from that my qualms that are in there 568 okay okay we'll be able to see that 568 our targets 563 so I got a few thousand to go okay so this this goes to show you how lazy I am I got tired of turning this dang thing and it's you know it's just kind of an awkward arrangement here in particular because this plate this is something I had and it's a little long I wish my hand bumps into this as I go around so it's kind of uncomfortable so here's a little trick for you guys if you need to make an expanding bushing so this is just a Delrin bushing here that happens to fit this bore pretty nice okay I could put it in but what I've done is I've tapped the pipe thread in the end which is tapered okay and then I've split this bushing into the thread and so I'm going to drive this is my driver here so I'm gonna get it started push it in a little bit more and then that's going to expand there that got there it goes okay I can expand that bushing and then I'm going to put a little friendly for this drill on there okay so now I'm power key I'll keep my arm from wearing out for your interviewing entertainment okay so let's get back to some great I pick 3 7 K which we close my cordless battery to Jonah all righty be right back Thomas easier looking a damn over there I didn't have a super-nice you know I'm cutting with the whole side of the wheel there I probably would leave the wheel but it's probably fine for making it perpendicular to this surface here and then we'll lap it I think we're just going to move on and do the other cylindrical part all right well there's the finish for the cylindrical part I wiped it off I didn't polish it or anything we're using a 30 to a 60 in an I hardness with a real fine real slow fine dress and there's the end surface there I'm not super happy with the end surface but I think that's just going to come out in the wash when we lap it so should be pretty perpendicular to the the cylindrical part so we'll have to see how it goes from there so I'm going to flip it around and then I'm going to do this end next for those of you that are wondering I've modified this screw a little bit I don't know if you can see that I added a little bit of silicon bronze to the tip of this steel screw that way when I crank down and stuff like well it probably wouldn't mark this because this is 60 Rockwell C but when I put other things in there this these hard screws tend to mark things so most guys put a little little copper slug under there or something like that and but I just modify the screw and I put a little uh well build up on there in silicon bronze so okay so I'm going to flip it around I'll indicate it then we'll start buzzing that side

Channel: oxtoolco

Views: 137,904

Rating: 4.9061127 out of 5

Keywords: Machinist, Adam Booth, Mr Pete, Abom79, Diresta, Make, Welding Tips and tricks, Bridgeport milling machine, Lathe, Instructables, Autodesk, Solidworks, Keith Rucker, Lathe threading, CNC, Five Axis, Steady Rest, Broken Tap Removal, Albrecht, Jacobs, Cincinnati, Kearney Trecker, Hardinge, Monarch 10EE, Starrett, Morse Taper, Mori Seiki, Tormach, Wilton, Toolmaking, Edge finder, Cylidrical grinding, Harig, Hermann Schmidt, Taft Peirce, Tool steel, Heat treating

Id: u-UsU6jFcEs

Length: 21min 3sec (1263 seconds)

Published: Thu Feb 04 2016

Reddit Comments

[u/bigboy101011]

Tom Lipton has some amazing things on his channel, you should check the Wilton baby bullet series.