Inside Doc's Machine Shop

[DocsMachine]

Winter is very nearly upon us, and as today was still relatively warm (high forties, F) I took a few minutes to whip up one of the secondary projects for this machine.

I mentioned before wanting to replace the collet tray that came with it:



The slides, judging from photos of other machines online, are factory, but the wood plate is some shop-made replacement. The factory one, I think, appears to hold 37 collets, and has a selection of smaller holes for things like allen wrenches and turret tooling.

I suspect the original got damaged years ago, and somebody swapped in this one- with fewer holes, which are too tight, and fewer of them. Between the tight holes, the slightly erratic spacing, and the too-thin wood, as well as the limited use of space, I've wanted to replace it since the thing rolled into the shop.

So, to use up one of the last reasonably warm days of the year- since I have to do some of this work outside- I got out a leftover chunk of some sanded cabinet ply I had laying about.



I cut a section the same width but a few inches longer than the old piece, and then did a little playing about with spacings to see how many collets I could jam in there.



Turns out, with a little luck, I was able to fully double the density of the old tray, and fit forty-eight collets in there. These I laboriously cut out with a holesaw- laboriously as I had to stop after each one and pry the waste disc out with a screwdriver.



Using a small-radius roundover bit on the router (the one that came as the spindle for my Shapeoko ) I smoothed up the edges of each hole, as well as the outer edges of the whole sheet. After that, I sanded everything thoroughly with 220 grit and blew it off with compressed air.



And finally- at least, it was all I could do this evening- I have it a quick wipe with some stain, and set it aside to dry.



When it's dry in the next day or two, I'll hit it with a couple coats of rattle-can poly clear. And once that's dry... that's pretty much it. It's done.

Doc.

[DocsMachine]

And check off another project on the 'finished' column!

After the stain had had a chance to dry, I hit it with two coats of spray gloss clear polyurethane, and let that dry:



Once that was done, it was a simple matter of bolting it back down, using the same screws I'd used on the original (which I replaced from the old beat-up flathead screws.)



And all that left was giving each of the collets a little cleaning...



And gathering some of the other collets from around the shop, to finally get them all into one location:



The two rows on the left are "factory" sizes, although a bunch of what came with this machine are kind of oddball, as I mentioned, with things like 27/64ths, 13/32", and at least one which was probably originally poorly laser-engraved, and the engraving has since been rubbed off. (And several of them need a deeper cleaning to scrub out the slots and internal threads- I may run some through the ultrasonic cleaner at some point.)

But, for the first time, I now have a small surplus of proper storage. I plan to add to that a bit, as I want a small rack that holds maybe six to eight each, at both the Omniturn and the little Hardinge, and I keep meaning to make one that holds maybe 14-16 at the Logan.

Doc.

[minimag03]

How much longer shall we wait for more Tanto barrels? 😥

[DocsMachine]

I'm hoping before the end of the year. No promises- some days I can't even promise having time for lunch!

That said, it's worth noting that that sheetmetal splash guard I made a couple pages back, was specifically for being able to use the 3-jaw to bore the Tanto blanks. The last batch I did, I had problems keeping the bores concentric, and managed to scrap too many pieces. I think I have it solved- at least as solved as I can get without buying another $20K in machines- but right this second, I'm still mopping up from a rather chaotic summer.

I wish I could make this stuff as fast as I want to, but I'm still just one guy, trying to do everything, using a roomful of antique machines.

Doc.

[DocsMachine]

Finally- finally!- after an entirely-too damn hectic summer, I've finally gotten The List® pared down to the point I can finally start getting back to stuff I was working on months ago. One such was those two baskets of Trracer-Spacers:









For those that care, I have forty in .675" (or should be once anodized) and forty more in .680". (Ditto. They'll at least be within a thou or so.)

I have two other parts to finish up this weekend, and the whole batch, including a few parts some of you have been waiting entirely too patiently for, will finally go out Monday.

After those are off, I have over 200 other parts I need to finish up, and with a little luck, those too can be on their way within a week or so.

Doc.

[Cal440]

Please put me on the list,thanks Doc.

[DocsMachine]

And they're off! The anno package, with parts for ant least three of you-lot's projects, is finally boxed and ready to ship out in the morning.

I have to sincerely apologize to those of you I've kept waiting, and thank you heavily for your patience. As per tradition- and I've actually managed it a few times - I plan to have my benches completely cleared off by the end of the year. If for any reason you think I may have overlooked you- it's all too possible- by all means feel free to send me another PM or email or smoke signal, or personal, heartfelt message hand-delivered by a large Italian gentleman with a bad suit and a facial scar, with a kneebreaking hammer in his back pocket.

Along with your parts, I also have a just-completed batch of the above-mentioned Trracer-Spacers. Those, with any luck, should be back in time for Black Friday, and of course since you nutballs inspired it, you all get first crack at them.

And, we even have video!

Doc.

[Funsi00]

Have you decided on pricing yet? I could be interested in two of each 675/680 sizers.

[OpusX]

dang it...gonna need a 675

[DocsMachine]

Funz- probably around $30-ish. I'll have a total once they're back from anno. Probably offer a set for a small discount.

Doc.

[DocsMachine]

Little bit of today's production:



These are a couple more short runs of my "Bull" barrels. I just need to crank out the matching tips in the next day or two, and these too will be ready to head off to anno!

Doc.

[DocsMachine]

Mister Video! No, not Captain Video, this was before he became a commissioned officer. :green:

There were complaints about my videos, that due to the gushing oil, you really couldn't see the actual cutting action. So, I picked up a lightly-used KoolMist sprayer assembly off eBay last week, which sprays a thin mist rather than a stream of liquid, and finally had a chance to try it out.



I was already in the middle of making a run of tips for the next batch of my "Bull" barrels, so here was an ideal time to try it. (Although I did use some scrap material in the video, as I didn't know how well it'd work or if the surface finish would change. The cutting action is the same, though.)

The base just clips to the headstock magnetically...



And the air line just needed a QD and an adapter. I couldn't find my inline regulator, but the mister can take anything from 60 to 120 PSI, and my air system is regulated to 90, so I just ran it straight for now.

The lightly-used kit I got came without the tank, so I needed a way to hold a little clean oil- I didn't want some of the smut in the main sump to clog the sprayer nozzle. Just as a trial unit, I took an old door-catch magnet and a soup can I usually used to sprinkle floor dry (washed out of course) and made a quickie little container.



That rests on the inner frame, and the magnet keeps it from tipping or spilling. At some point I'll come up with a proper tank, but this got me going for the moment- and, the mister will pretty much only be used for video demos rather than day-to-day production, so capacity isn't a real issue.

In this shot, you can just barely see the mist coming out the end of the nozzle.



I haven't played much with the various mixture settings, to start with I was just happy to see that it did, in fact, work with the cutting oil. I'd worried that it might be too thick for the venturi/siphon effect to be able to pull it up the hose.

Also for video clarity, I popped the regular oil lines off, and closed the valves- as well as deleting the pump-on command from the program.



So, without further ado, here's the result!

And while we're at it, I needed a new tool to be able to do that groove. Previously I'd used the parting tool, but that's a big, beefy assembly that takes up a lot of space on the tool slide. I needed something smaller just to groove, rather than part.

Luckily I had a chunk of 5/8" cold-rolled in the bins, and a slotting saw of just the right width:



I tried a much thinner saw to slot it deeper, but it really didn't like that, So I went ahead and drilled and tapped it for the clamping screw...



Cross-drilled it, finished the slot with a hacksaw, fitted it with one of the leftover MGMN200 inserts, and finished it off with a clamping screw out of the bins.



And that, to my entirely feigned surprise, worked perfectly.



That piece, by the way, was simply an accidental test part, as I did a couple cut-and-try cycles to get the tool zero just right. But, that test part kind of actually works.

That is, it lets you screw two classic Freak tips together, nose to nose. Which, of course, serves absolutely no purpose whatsoever- it's like screwing a pistol to both ends of a silencer. But hey, I don't call myself a mad scientist for nothing!



That tomfoolery aside- hey, I gotta be allowed my fun- after several days of run time, I had a nice batch of the "Bull" tips in two different lengths, as well as a nice small run of what will become more of my Flashpoint tips.



Most of the 'Bull' stuff is already off to the anodizer, and with a little luck, and possibly a hefty bribe, I should be able to get those, above, parts and a few other things sent out by early next week.

Which damn near catches me up to where I was hoping to be... about last June.

Stand by, more in the way.

Doc.

[superman]

What does the setup look like when you finish the OD of these?

[DocsMachine]

What does the setup look like when you finish the OD of these?

-I still do a lot of this stuff manually. I'm still a lot more old-fashioned machinist than I am modern production button-pusher. (Remember I just rebuilt another old turret lathe. )

In this case, I do the OD as a final step between centers on the Sheldon:



I've also done it on the Logan, and one of the first batches of these I did last year, I did in the Omni, with a chunk of scrap Freak barrel held in the collet. That usually took a quick grab from the strap wrench to loosen, though, so wasn't much of a time saver.

Doc.

[maggot]

You're an artist, Doc. Truly amazing talent. Got caught up on this thread today and it's phenomenal.

[DocsMachine]

One common accessory for both turret lathes and some of the conventional lathes, is a work stop. It's a fixed feature mounted in the spindle, or attached to a collet, etc. that lets you put a part into the machine, and holds it in a repeatable position.

That is, if you have, say, ten parts, and they all need to be faced off to the same length, you set up a stop. The part is put into the collet or chuck, butted up against that stop, so that if you take a cut to the same setting on each one, they all come out to the same dimension.

Things like 5C collets have internal threads, and you can screw an internal stop into it- so each part put into that collet, ends up in the same relative position.

I have a drawerful of such 5C stops (I have five machines that take 5C ) and have fitted both the Sheldon and the Omniturn with adjustable stops that fit in the drawtube. That way I can do longer parts than just what can fit inside the 5C.

Unfortunately, neither of those fit the new Rivett, and I had some nominally-12" pieces to drill and tap, so I had to take a few moments and make a new one.

I found out that, after removing the collet closer (I'll be using the 3-jaw for this) the bore of the end of the spindle was right at 1.500", with a slight step about half an inch in. I found a chunk of 1.5" aluminum round in the bins, pondered it a bit, and proceeded to stab it with spinny blades of death.



I needed two "clamping" features- expanding on one end to hold the bore, and the other contracting, to hold the stop-rod. The expanding part is tricky, but I've done a couple of these now- you use a setscrew, in an incomplete thread made with a taper plug tap. That way, as the setscrew is screwed into the hole, it wedges the parts outward to hold onto the bore.

I found a couple of stubby, coarse-thread 7/16" setscrews that looked like they wanted to join the party, marked off and drilled a couple of appropriate holes, and then ran the tap in 'til the screws were just flush before they started wedging.

I then used a slitting saw to strategically slice the part, so that the screws could actually move the material. The fit to the bore was pretty snug "at rest", so the required wedging movement is minimal.



The only trick being that you have to reach them from the outside- so there are passages drilled from the outer end to allow Allen wrench access, and you turn them counterclockwise, as if unscrewing.



Then, on the outer half, I bored the center to a close running fit to the aluminum rod, cross-drilled it to help allow a tiny but of flex, then drilled, counterbored and tapped it for two pinch bolts.



Et voilá!



She fits like so, and holds quite solidly. The rod can adjust basically the full length of the spindle, allowing parts- using the chuck- of almost two feet long if necessary.



Now, the trick with the rod is that we need a disc on the end, that's close to the diameter of the ID of the spindle. Sometimes parts are hollow, and a plain 1/2" rod wouldn't work. The disc allows it to contact any part, hollow or not, and being close to the bore size, helps keep it from "whipping" when spin fast.

So, I found a thick disc of aluminum in the bins- a core left from a holesaw- and drilled and tapped it to 1/2" coarse. I threaded the end of the stop rod to match, loctited the two together, and using the rod for an arbor, turned it to size and shape.





All that was left was to cut the excess off the rod and install it, set to accept the part I'm working on.



I just need to set the drills and tapping head in the turret, and chances are the actual job will take half as long as it took to make the tool.

Doc.

[DocsMachine]

One quick mod to yesterdays part stop; Since I was dealing with a long, thin part, I decided I'd make a second internal rod, this one with a concave coned end. That would help center the far end of the rod, hopefully letting it all run a little truer.

So I rooted through the scrap bin, and found the old shop-made ball handle that came on this lathe's speed control. It's not factory, the original one was typical black phenolic. Either that was broken or lost at some point, or some operator decided they wanted a bigger "shift knob". I swapped it back to a black phenolic ball during my 'rebuild', and dropped this in the bin for eventual reuse.

And, since it was plenty big and already drilled and tapped for 1/2" coarse, that eventual reuse was now.



It was a simple matter to turn it down to a cylinder, and then bore out a rough cone...



Then, just as before, I threaded the end of another chunk of 1/2" round aluminum, screwed the cone on with some loctite, then trued the OD to size, and smoothed up the cone to blend in with the rod.



It fit right into place, of course, and let me set up a center drill, tap drill, and the little releasing head, to make quick work of drilling and tapping two dozen 12" or so rods.



This is the exact part and situation I was concerned with that braking resistor, faulting the VFD when reversing to "unwind" the tap. Thankfully, it worked great; zero problems, zero faults, both the machine and the tapping head worked great.



And, as I predicted, making all the tooling took almost three times longer than it did to actually do the job.

BUT... that tooling made the job easier and the results more consistent, and, of course, I'll have it all ready for the next job.

Doc.