Zentra six jaw chuck and backplate

[Music] hey welcome back as you can see I bought a new chuck from a late this is a hundred and twenty five millimeter six jaw chuck made by Sentra which i think is a bizarre clone or Abby's on licensed product but I tend more in the direction of clone these are made in China of course costs way less and for example a room six jaw chuck especially beautiful steel body and the fine adjustment the SEP true high true buck chuck whatever you want to call them fine adjustment that can move the Chuck around on the back plate currently I have a sweet Chuck as most people on my life as my main Chuck but I wanted a six jaw for a long time because it do a lot of plastic and it's easy to wiggle apart a plastic part out of a three cha-cha and throw it across the room because there is so much space between the three jaws and then you can lever the part and the plastic is soft and works itself out of the jaws and with the six jaw chuck this shouldn't happen because space between the jaws is very small half as big basically and yeah I finally wanted a chuck with set through with the adjuster that means you mount this on a backplate then you have four set screw and the centering spigot here on the adapter plates under sized and you have four set screws when you loosen this the mounting screws that hold the Chuck on the back plate you can move the Chuck Robb very precisely with these fine threaded set screws these are mm 12 buy one fine thread and set screws very large diameter fine thread and set screws very very long strand engagement as you can see these are these are hard to wear up and why am i showing this to you not because I want to brag but because I want to take it apart as you know don't turn it on take the power my usual procedure with Chinese chucks and call it chucks and wisest and what not is you get them you take them apart you clean them and you do some deeper ring that didn't happen at the kind the manufacturer most of the time and yes six jaw Chuck even from Sentra is not cheap it's 450 euro I bought it from Santo here in Germany but I'm pretty sure you can get them all all over the world and yeah I got it delivered within two days all good came came 50 inside step-step jaws for large diameter came with me outside stepped jaws for small diameter work came with a chuck wrench I love I love I don't know how this happens all the time I always lose the spring on that on the key king with 12.9 grade high-strength screws to mount it to the back plate like this and overall fuel is very good on this Chuck the action this is very nice and tight this is not this is not a free spinning Chuck the jaws very tight in their guiding slots and it feels like the warm the spiral year in year it's also very tight fit in the body let's get the jaws out they put a liberal amount of grease on them which is nice it's better than lapping compound which I had also or grease mixed with cast iron rod and grit so that's a nice touch huh I'm not sure how you go up good to go but I guess we have to unscrew the backside okay I technically screws down reasonable it like crazy also 12.9 strength screws and there it goes tada okay there is a dowel pin for alignment this is good so it cannot go together in the wrong way there are some grease in here all in here is quite massive this is all steel yes this is a steel body chuck not not a cast okay these parts will all go in the ultrasonic cleaner or some gunk on them okay this is an interesting construction the pinions come out there together with the bushing they run in opinions are secured in these bushings or if this Halfmoon ring this goes out this's seems to be ground to thickness as it's a really tight fit in there and this secures the opinion in this bushing the steel gushing and drop this out and this is all ground all around including slit and we can hit it with a metal file yeah this is hardened I'm not sure if these parts are match fit so I better keep them separated yeah there's a there is a large amount of grease in there not very dirty some burrs but those will clean up fine there's dolphin that aligns top and bottom this is this is nice it cannot go together the wrong way see if we can get the spiral ring out there she's a plastic and just oh yeah this comes out there we go yep what do you expect it the the gear side is machined okay the the spiral here is really machine very nicely almost looks like a ground finish on the spiral itself looks decent to me the pinions are so and so at least the sliding surfaces are ground but the opinion itself is relatively rough machined or whatever so I will clean all these parts and then I will come back so I deferred everything put it back together with some molybdenum that sulfate and there's another thing with the set screw chucks that Robin mentioned the register diameter on the back plate is four smaller than the idea of the chuck and chips can migrate over time between this larger diameter and the smaller diamond down here and crunch things up and you want to avoid that he's shot to use a piece of a pool noodle cut down a thin slice and put in here as a seal and I just cut a piece of packing foam peewee foam polyurethane foam to a ring and this will do a thing will crush down to the thickness of the gap and seal out any chips the backplate goes on like this and as you can see there's a gap it crushes down nicely and I've just used flat packing foam it thick cut up with scissors and the ID with a scalpel so let's flip this around drop the screws in there we go that's the Chuck with the backplate you're on yeah just the screws that can slide back plate around and here you can see the flat side machined on here this allows me to clamp the chuck in the whites of the mill if I want I would have to pull out these three studs of course because we stick out too far this is spindle nose of my lathe as you can see has a plain face and the cylindrical shoulder here it's very similar to a short taper spindle nose with bayonet disc this is the locking implement the chuck has three spots on the end they go through the bayonet disc then you twist this a few degrees and as you can see closes up then you tighten the three nuts all around and you're good normally this the sign of a spindle has a taper here seven degrees something something on the smaller hobby Leafs you will find a lot of times that there's just a cylindrical diameter there we go I only have short approaches I have to clip the part around and there we go well not even the halt the road approach is always a nice fast way to punch a hole through some material and always leave some nice slug of material [Music] I'm boring recess that goes on to the spindle nose and it's always a good idea not to blow the Catherine dust fine graph its iron mixture all over the shop with compressed air that's a case where the or the vacuum cleaner is a good idea I'm shallow large diameters like this internal diameters I like the two-point internal mics very much they were great well on small diameters not so much some large ones they work very good and I'm taking I'm using as usual the technique of balanced cut I took I'm point three millimeters away from my final dimension I took a point one five millimeter cut now I'm checking my dimensions if it's the same as I read on my Dro which it is otherwise I would have to correct slightly and now I can take my remaining point one five millimeters and I will hit my my diameter here perfect without any guesswork without any hooba-dooba or whatever just by taking even cuts on the last two passes and measuring in between [Music] okay there we go cleaned up the OD to the same diameter in fact 0.5 millimeter on the size Judy oh do you have to check because when the Chuck moves around with the adjusts through function I do not want the flange overhang the Chuck won't always the Chuck to be overhanging while I have it still in the Chuck it took the whole Chuck with the flange mounted in it off the spindle to do a test fit and the reason for that is that way I can mount it back on the spindle and not lose my run out and my my trueness of rotation and whatever but I still can test fit my spindle my my adapter plate here to the spindle nose but as I'm very confident in my measuring equipment oh there is not a problem a disease yes that's good okay let's get the check back on the spindle let's clean out all the cast-iron gunk back here and this Chuck is not Chuck Norris I'm going to put some shim stock under it because they do not want amar up my new freshly mission surfaces here this on machine part this clamping latch to the head in the Chuck will get removed once I turn down the the diameter for the suite for a sixth job Chuck say that a hundred times fast six drop truck [Music] and just surface grunt the backside of the flange the travel of month across Traverse Travel of my grinders too small to hit the old surface at the spot grinding technique take one pass rotated a little bit take a pass rotate to the bed and so on and so on until you get all the way around and to sleep release this neat pattern which looks kind of cool and a pretty darn flat part even if it overhangs the travel of your grind or a bit it's definitely time to build a spin grinding fixture Roderick grinding fixture like a spin table for for surface grinding now we have just a book and that's the weird pattern you get by this technique I I really like this thing this look of a surface checking for parallelism which is not super important but I want to see if the surface is flat too and this is a 1 micron indicator and that's okay I'm measuring a lot of surface roughness here but I think that's not too shabby keep in mind this goes on a lathe not on a cylindrical grinder clamp the part to the table and I'm centering it with my down test indicator already got it already got it centered up pretty good I will change to a grille dro truck and drill these three mommy holes with a m10 thread setting up the Dro for bolt circle it's bolt circle pitch circle bandar and XY direction position is Sara Sara that's the center of our bolt hole pattern diameter is 74 millimeters starting in with Sara and angle is 360 number of holes is three but to make it easier lifted the arrow we enter four otherwise the end angle has to be 360 minus 120 degrees and if I just enter one hole more I can go zero to 360 that's our first hole position you have to be an absolute not an incremental otherwise you get a pretty messed up decision [Music] power tapping the end ten threats I'm holding the the tap in a room keyless chuck and generally those do not make a problem in my experience with power tapping the room buttons are not they are very decent chance not as good as a albrecht but they're very decent and reasonable price and they work for power tapping very well even up to an 10 or maybe and 12 threads and at least cast iron and steel it's not a big problem I'm borrowing these studs from my street job Chuck cannot buy these these are not off-the-shelf stops so I turned an out of 42 chromoly myself so I got the flange mounted to the spindle turned it down to the right diameter for the adjusts through set screws and I relief the center about to here and to chuck is only sitting on this rim out here about a band of about 20 millimeters list [Music] okay okay I cut two flats on the both sides parallel to each other onto the flange or adapter so I can hold the Chuck where's the dark plate and the Y's if I need to do drilling work on a part that I turned the lathe and one set up and not lose my precision offset in the Chuck maybe even have to go back to the lathe it gives you more options that's again something that robinred said he showed on I think you showed it on Instagram and so it's a good idea to do it okay I put me flange on my surface grinder and as you can see this was about the maximum height that can grind on this machine I'm hundred and fifteen millimeter above the magnet and it's getting pretty tacky right I have about half a millimeter of travel left after we log I'm using right now was not worn down so far like with a new learned 2500 meter will I would not be able to grind this so I always like to keep a small wheel around with this grinder [Music] [Music] get the Chuck mounted on the lathe and have a piece of 20 millimeter hardening ground Brown stuck in the spindle which is nice straight down round and I'm indicating it and this doesn't look too good but that's that's because I have not set the Chuck to run true anyway this proves in front here that hold to check to the back plate our semi tightened just so the Chuck does not fall off and slide around that oh oh I were indicating and you look for the lowest spot like this this is minus 32 and this is plus 4 so if we tighten this screw here with a lift the chuck up just like this and we're already pretty darn close a little bit here and that's the first time I use a adjustable sweet child Chuck or six jaw sorry this is well within two one hundredths of a millimeter I can tuck down these prison front here let's see as you can see it's silly run-up now let's open it spin the borer around a little bit back this this locks so nice and solid I'm not true which of the pinions are used oh yeah yeah that's the trick with a scroll scroll jaw chuck you always have to use neat to use the same pinyin see when I use this one loosen the part spin it a little bit and retighten it it it runs that's true again if I use for example this kingdom Ronald will be all over the board point oh four millimeters it's not too bad but if you'll want to do precision work and repeatable precision but you always have to use the same opinion because the the scroll gear scroll thingamabob in here will squirm around in different directions and always using the same pinyin will always load it the same way and give you the same run out so if you go back to this opinion BAM almost here around and I know the argument a lot of people tell you that scroll Chuck and relief does not need to run true because it's only a first op tool and your door operations will help you to make parts so it's just not necessary to have a good runnings scroll check on the way I'm a complete opposite opinion just because people say that you don't need one don't let to stop you from getting a good Chuck and make it run very well make stuff so much easier if your check is not all over the place if you can't handle a part indicate it in and have it run basically Cyril and yes there is famous for jaw check but that's nothing for the work I do I really have work that needs a for joins and in fact that I had on the for China pendant small one but I used to over the last year never everything I do fits in the three six or whatever truck or in the car or on my face basically for Chong and this has I hope you enjoyed this look at the centrist its jaw chuck and making of the back plate and because I've gathered in the video itself the material for the back plate is continues cast gray cast iron GG 25 so thank you all for watching and see you next time [Music] you

Channel: Stefan Gotteswinter

Views: 61,706

Rating: 4.9661493 out of 5

Keywords: zentra, six jaw chuck, sechsbackenfutter, backenfutter, lathe, drehbank, stefan gotteswinter, cast iron, surface grinder, flachschleifmaschine, futterflansch, backplate, chuck

Id: G0Fqh29Pxvk

Length: 29min 12sec (1752 seconds)

Published: Sun Jun 03 2018