Fitting a SANOU Self-Centering Four Jaw Chuck

okay welcome back to the workshop this week we're going to be testing a Chinese four jaw self centering Chuck supplied by banggood. We will see how good it is and to do that we'll be fitting it to the lathe. We'll be making a backing plate so I've got a basic starter kit for a backing plate from LPR Toolmakers that will work with my screw threaded spindle Myford lathe. So we'll fit that make sure it fits to the spindle and fit it to the chuck and then set everything up. So the first thing is: Let's have a look inside the box and see what we get! Okay so the first thing we'll look at is the backing plate they come with this 8 TPI inch and 1/8 thread that Myford uses. Normally this this rebate here, or boss is usually not not quite right. What I did last time was to put it on the face plate and bolt it on and then just clean that up. Ideally we don't want it sticking out any further than we have to. The further back on the spindle we can get this Chuck the better! In here we've got the Chuck. The Chuck key. Feels good! This is our job here I've got to do. looks good While we are here, we'll just take it apart and see what's inside! pretty good just tap that out That one just came straight out. No need to tap it. the accuracy accuracy of these chucks is largely determined by this surface here and and it's mating surface there and how well they fit. Any non repeatability in your chuck, that's where it comes from Let's have a look at that surface... Okay so here we are. We've got the facee plate set up with some nice clamps and it's just loose at the moment. Okay so here we are. Looking pretty good. So we've got the indicator set up here. That's high tap tap that's high that's high that's hi there We should be good to go! Okay the first thing we want to do is reduce reduce the depth from the front of the plate to the back to be one inch or 25.4 mm dimension is 26mm. Half a millimeter (over) just in case just in case. Probably doesn't matter. So now we have to break out the boring bar and machine out that clearance here. It might be a great chance to use the old depth stop which I made! So this is my depth stop here and you can see that this is connected to the saddle and it goes out to here and this sets the depth like that see. So that sets the depth. So what we do is we press it gently up against the face there and the DRO is zeroed and then we want to go in 0.5545 mm Now if we push that up against that nip that up nice and tight. and that should do it. Now it's just a matter of skimming off those threads. What have we got? Really nice! Pretty nice finish I think that's pretty good. This should be a good test. If I have made my... Yeah good. (evil laugh) Not bad! We're on the money there! beautiful!! Right now we can take a... Better clean up that though. That's a nasty edge. All right so the acid test! I've taken the face plate off. Have we got the depth? Lovely! Let's see what it looks like That means were as far back as we possibly can get. It's perfect. The chuck can be as far back as it can possibly go without compromising that connection okay we've got the depth stop set at 9.9 mm. and a new insert and all we have to do now is turn down to depth. yeah! okay we're gonna mount this on the on the chuck and machine off this front plate here so that we can reuse this... (dramatic music) That's not gonna work!! okay let's put everything together. We've cleaned it all up. We've stoned down any rough edges to make sure it's nice and clean. First thing in is the scroll and the pinions. I have only put a bit of a light coating of wd-40 on just to make sure there's no possibility of any foreign interference. Pinions go in. Then these retaining pins, I guess They don't really need to be tightened because they can't come loose. The backing plate keeps them in there and if you over tighten them they bind. That looks good and then this retaining... plate and then .... bolts. I've got a little bit of play there probably half of a millimeter or so just to just to allow us to center ... make sure the chuck is centered. Yeah that's number two three four What I always do when I'm putting jaws in a chuck .. to see that I am in the right (position) is to turn it backwards until it clicks down Next one in.. look at that that! That's pretty smooth motion. and there's a bit of sideways play in those jaws. ... And a bit of backlash which is normal. So let's put it on the lathe and see how it goes. That's better! and the way we get this right is there we go (magic sound) now that's about as good as I can expect it to get (having done this a few times) I've never got it better than that. And what I've made is this and this this will let us check how well the Chuck performs at different diameters. I hold that up against the jaws like that zero that roughly and take a look. what are we doing? Two! thousandths. yeah they're half that half thousand degrees if we go into the next one the next step we're about three three thousands two now - little bit less than two. Not bad. Not bad at all really. - good again turn off I want you to grip on there that five there I don't don't know if it's a fair test though, there's not much to grip on,. I will try it again and then there is half! haha look at that!!! so within 2 thousandths over that full range. Very consistent. That's not bad I'm happy with that! Okay so we've got our chuck on. We tested it out, and it's accurate to within two thousandth of an inch on average. I don't know if you could get it better than that with a bit more fiddling around that's quite okay from what I need I think it'll be quite a useful addition to the workshop. So I hope you found it useful and thanks for watching bye for now (crash sound) Jesus Christ!!! that's what you don't want to do!!!

Channel: John Creasey

Views: 54,441

Keywords: chuck, self centering four jaw chuck, backplate, lathe chuck, fitting a lathe chuck, sanou self-centering, 4jaw, 4 jaw self centring, chinese chuck, are chinese chucks any good, machining, metalworking, sanou, myford, myford ml-7, threaded spindle, threaded chuck, fitting a backplate, chuck accuracy, chuck repeatability, sanou chuck, scroll chuck, 4jaw scroll, myford screw, this old tony, clickspring, keith fenner, three jaw chuck, 3jaw lathe chuck, 3 jaw chuck, chinesium chuck

Id: GKSCEKPJJg8

Length: 22min 46sec (1366 seconds)

Published: Thu Nov 02 2017

Reddit Comments

[u/OG_Elite_Pyro_Mage]

God I love lathes and machining.