Making Parts for CAT 631 Scraper | Milling Machine

how you going guys Kurtis from cutting edge  engineering today's job we have some replacement   parts to do for a customer's 631g scraper so the  parts we're going to be making are the mounting   plates for the guide rollers on the back of the  ejector door the way an ejector door works on   a scraper is the door is usually all the way  back when they're loading so that big cylinder   will draw back creates a big void in the front  of the bowl when they drop their bowl into the   ground it then loads itself by the propulsion  of the machine they pull down the apron door   lift the bowl up in the air and away they go to  their next part of the job site they want to fill   once they get there they flick up the apron door  the ejector door then uses that cylinder to push   all the material out the front of the bowl then  they'll retract that once it's empty pull the   apron door down and carry on to the next cut so we  were lucky enough to be able to come over to the   customer's yard and show you exactly where these  parts live on the machine where we are right now   we're in between the two back tyres these two  rails here is what holds the ejector door from   tilting forward or backward when they're pushing  out a load or they're drawing the door back to   then take on a new load mounted to the plates  we're going to be fixing are a set of wheels and   a set of offset pins that can be turned to allow  pressure to be pushed against the two rails what   happens is the bearings fail or the wheels jam and  they end up chewing everything apart so they do   a lot of damage they generally fail by rocks that  you know might get flipped off from the back tires   they get caught they lock everything up then they  start to bend and break everything the mount is a   part of the original casting on this back part of  the ejector door when they wear out the easiest   thing to do is just to cut them out and put some  new ones in it is pretty important to get them in   the right spot we have designed a replaceable  part that is very simple and very easy to fit   to the machines so it can be done very very  quickly on site the way these come apart is   you undo the locking bolt which clamps the axle of  the rear roller together you then turn the wheel   around and if you look on this one the wheel has a  flat spot on the bottom of it you turn that wheel   and you can then pull it past the rail so you do  have an offset axle inside the bearing and you   just turn it lift it up out of the road knock the  axle down and you can then cut out the old part   set up your new one and weld it back in it's quite  quick to do this a guy used to work with he and i   used to do these during a smoko break on a job  site one mechanic comes in pulls it all apart i   come in behind him cut it out cut the other side  weld some new ones in he puts it back together   again so the machine's not down for very long  these parts i will be making are ordered to go out   in the field and be fitted on site nice quick easy  way to repair a problem that would otherwise be an   absolute nightmare this machine's still in pretty  good shape but we thought we just show you exactly   where they were as it would have been quite  difficult to explain this standing in the workshop righto guys so we're back at the workshop  we've got four of these mounts to manufacture   so i've got four bits of plate here we had them  pre-cut in the container ready to go the plate   is 50 mil biz80 so the first thing we need to do is  we need to grind all the mill scale and everything   off them and just clean them up before we go and set them up in the milling machine righto guys so because these are a flame  cut part it's going to be pretty hard to get   a reference of level from the top of them i mean  i can just run my hand through that and feel that   the sides are quite nice but the top has a bit of  a lump in it we always get a little bit of extra   material on the part so we can then trim them up  to the right size now that i've got them set up   and they are sitting pretty well parallel with the  machine i will face the top and the sides of them   and then that will be our reference for the  rest of the measurements for the rest of the job righto guys so what we need to do now we need to  find the center of the job so i'm going to use   an edge finder what's down the bottom here is  actually also up the top they are two perfectly   machined faces that that works on and there is  actually a spring inside that that holds the   two parts together what's going to happen is i'm  going to move the job up against this edge finder   and when it slightly kicks off to one side and  stays there without wobbling around it that is   the true edge i then use my dro i zero that out  come over the other side and do the same thing divide that by two and there's our center so i've just discovered there's  been a problem with the cutting   on these parts the hole is not where  it is supposed to be but it is going   to clean up where it needs to  we'll still get the job done so i've got 0.9 of a mill to come off drop it righto guys so we've completed the boring for the holes where the pins need oh well the axle or the pin need to go   what we need to do now is machine a 45 degree  bevel on both sides of it around the back   radius for the weld prep we've set the head  of the milling machine up on a 45 degree angle we're going to use our rotary table  to hold the part using a three jaw   chuck that's attached to the rotary table we've got a 25mm indexable end mill in there we'll use the table to rotate the part  around the cutter to cut the bevel right so now what we need to do we need to  cut some slots through the plates that's   going to allow room for it to be clamped  onto a pin so what we're going to be using   is our horizontal milling attachment when we're  using the horizontal attachment on this machine   you do have to run the 90 degree head because it  doesn't have a horizontal attachment or motor or   spindle coming out of the machine this machine's  bigger brother does have the horizontal spindle   in it but the issue with having a horizontal  spindle you can't put riser blocks in your machine   to lift the turret higher so i've got two riser  blocks i can lift this head another 150 mil if i   wanted to and you couldn't do that if you had  the horizontal attachment in your machine to   have the versatility of a larger capacity  machine without spending an extra 50 grand   this is by far the best way to go and using the  90 degree milling head is the reason this doesn't   have an air drawbar we're going to be using  a 5 16 by 4 inch milling cutter more commonly   used for keyways and slotting because my  slitting saw blade that i wanted to use   is blunt i'd have to do two passes with that  to get the eight mil gap where in this case   i'll just use the one cutter full depth of cut  pass it all the way through should be good what's in here ah gift Homeless what's this made in the usa mmm yumy righto guys we've completed all the machining on  the plates now we do need to get these things   packed up ready to go because they're going about  400 k's north west of here customers got a machine   down at the moment when these are being fitted  into the machine depending which machine it is   if it's a 637 that's a twin drive machine  so engine in the front engine in the rear   it's very very difficult to get to these best way  to do them is when the door is all the way forward   and then you've got access to them but the last  one i had to go on site and do the door was   fully closed and it was full of dirt we had to  take the rear tyre off to get access in to get   to there the 31 series machines they don't have an  engine in the back so there is a bit more room in   the back of the machine to work on these we have  two ways you can cut these old parts out to then   fit the new one i do supply our customers with  a centering plug that has a center hole in it   they can then use a oxi torch with a circle  cutter to find the distance from the outside   cut all the way around nice quick easy cut and  you can do that when there's heaps and heaps of   room in the back of the machine but when you're  very limited for room and where the bin is full   and you don't have any access you can then  come in from the top with a straight cutter   and the same sort of thing because there's a bit  more room above you than there is around you to   be able to cut that part out and then all this  material that i removed here that is the weld   prep so providing they do a really clean cut when  they cut the old one out this is simply just put   straight back in place it can't go in any further  if they've cut it correctly they simply tack it on   and weld it out once these are welded into the  back of the ejector door the pin that goes down   through this hole and holds the wheel it has a  recess machined into it that's why those bolt holes   dissect the pin hole here this bolt falls  into that recess that's machined into that pin   they tighten up the bolt that squeezes the mount  closed and it grabs a hold of that pin nothing   can move then they do their adjustments they need  to do so with all these completed now we're going   to get them packed up and get them sent away so  our customer can get his machine back to work any cookie on my face or anything nope you're recording aren't ya yep righto guys oh righto guys so we're back at the  workshop uh we we're back at the workshop oh [ __ ] me where you going with that I don't know so we're gonna [ __ ] now i've lost it oh [ __ ] right [ __ ] um [ __ ] i lost it yeh oh there's something holy [ __ ] wrong there hey mate what's happening [ __ ] train where's the [ __ ] vise handle you mean the one on there similar yes [Laughter] and it's [ __ ] grown legs and [ __ ] off again [giggle] there's a hole through the vice in the bed [ __ ] i'd scrap the machine what oh that'd [ __ ] me that'd just burn my [ __ ] all day long does it have to cut all the  way through that jesus it's tinsel workshop tinsel it's extremely sharp and terrifying tinsel wouldn't want that hanging on my tree [squeaky pig] [Laughter] oi Homeless bring it here poor pig that's it crying help help [Laughter] bacon flavour mmm [giggle] [giggle] anymore pig [giggle]

Channel: Cutting Edge Engineering Australia

Views: 161,938

Keywords: cutting edge engineering australia, machinist in australia, machininst, abom79, cee australia, Making Parts for CAT 631 Scraper, scraper tractor, caterpillar scraper, 631 scraper, milling machine, Bridgeport milling machine, Bridgeport style mill, Bridgeport, horizontal attachment for milling machine, face milling, facing on mill, milling head, caterpillar wrenching, pan tractor, milling steel plate, adjustable boring head, turret milling machine, universal milling machine, CEE

Id: RaU9uHt5NnY

Length: 36min 9sec (2169 seconds)

Published: Thu Dec 16 2021

Reddit Comments

[u/Character_Shop9990]

The quality of your videos continues to improve. The effort that's gone into them is really apparent and really appreciated. We know from the outtakes that the narration is far from your favourite part of the work. I just want to express how much, at least this viewer appreciates it.