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Thread: What did you learn today?
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30th May 2016, 09:47 PM #586
See Richard. Now they are all coming out!
Dean
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30th May 2016, 10:11 PM #587Pink 10EE owner
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Found out I have more internetz to use before the month is out then I expected.
The wood turning was to make some plugs for a brass cylinder I wanted to turn the OD on.
Plugs are top and bottom as in the video and I could bore the entire OD in one setting.
Although it was a failure as the boring head was not rigid enough and I had chatter issues.
Video -->> https://www.youtube.com/watch?v=teb2oV4i1W8Gold, the colour of choice for the discerning person.
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30th May 2016, 11:09 PM #588Golden Member
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Adjusting the boring head out and reducing the overhang of the upper horizontal extension bar might reduce the chatter, do you have any of the extension bar reinforcing rings?
Something about having the short boring bar mounted in the long vertical extention bar looks wrong, all that extra weight suspended so far from the anchor point makes me think of contributing to any vibration, of course the opposite might just be the case. It might be worth making up a longer boring bar from 1" or even 1.25" stock to mount directly in the upper horizontal extention. Machine enough length down to 22mm for the mount and thread it for a draw bolt to pull it firmly into the extention, the thicker bar might absorb some of the vibration.
I can't be sure but is the tool ground positive? If so perhaps try a neutral or even negative grind.
Cheers,
Greg.
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31st May 2016, 02:17 PM #589Most Valued Member
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Well, no surprises there considering the flimsy setup.
I'm a bit surprised, though. I'm surprised that you did such a crap thing when you have a HBM with a boring/facing head. That setup is barely OK for people who don't have a choice, but you *do*.
What *were* you thinking???? I did a similar OD boring job recently in the Kearns S type, on a cast iron marine diesel exhaust elbow. It was totally trouble (and chatter) free.....
PDW
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31st May 2016, 03:14 PM #590Pink 10EE owner
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The HBM has no angle plate and is worn that I would not trust it to do that good of a job on it. it is a good borer, but not that good from a wear perspective and does lack tooling.
This was an experiment that might have worked in brass. Would never have tried it in steel. Unfortunately I do not even have small lumps of big pieces of steel around I can use to make plugs for the end to hold it.Gold, the colour of choice for the discerning person.
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31st May 2016, 09:07 PM #591Most Valued Member
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Haven't you any 12mm or thicker steel about the place? I machined a steel angle plate for the big HBM and 2 for the small HBM. Weld, machine on the HBM and then start turning them into swiss cheese....
Got no tooling with the big HBM but a full cabinet came with the baby one. Not too bad except that *someone* I know got 2 cabinets of tooling, a big angle plate and a 400mm rotary table with *their* S type HBM. However, I still have possession of their angle plate.....
I am planning on making a couple of the snout bar holders for the big Kearns. The things are so useful on the baby that I think they're essential for doing any sort of serious inside or outside boring work in the HBM. Sure, you can put a conventional boring head in the travelling spindle, but it's not rigid compared to a 60kg facing slide carrying a 2" or 3" diameter bar.
On tooling I'm waiting for some MT5 reducing sleeves to arrive so I can drill big holes. I'm having to buy more MT5 tooling and it's a PITA. Hopefully Mick Moyles will have some useful stuff when I get to Sydney.
PDW
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31st May 2016, 09:23 PM #592Philomath in training
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P1020692 (Medium).JPG P1020694 (Medium).JPG
Nah - just weren't holding your tongue right...
Michael
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1st Jun 2016, 06:17 PM #593Pink 10EE owner
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I have half an angle plate made. It is the knee of an old pallas milling machine, stripped and I only sandblasted it last week ready for the next stage.
Probably. PDW is right in though it was a flimsy setup though. I do have the stiffeners for the bars as kwijjibo99 above asked, but only the long extension is tapped for their use, the 3 short identical length bars are not tapped.Gold, the colour of choice for the discerning person.
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1st Jun 2016, 08:59 PM #594Senior Member
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Hi RC, you might have gotten away with that setup at a different speed, not necessarily slower just off the resonant frequency..either way. I assume you were using ABSOLUTELY minimal nose radius on the tool, zero rake & wiped off any finger grease with isopropyl alcohol..off tool & job. Don't laugh till you've tried it.
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3rd Jun 2016, 12:50 PM #595Pink 10EE owner
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I have put the boring/facing head back on mine to do a small boring job, but I am not really happy with the safety aspect. Having that huge exposed head running around at a reasonable RPM for boring out a small hole it scares me. Be OK for big stuff. I do have a plan though
The ones with inbuilt facing heads and OA models like yours have a much much larger spindle frame and the boring head is not so much out there but more covered up a little bit so it is safer.Gold, the colour of choice for the discerning person.
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4th Jun 2016, 07:10 PM #596Pink 10EE owner
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Today I learned loctite cures exceedingly fast when applied to brass.
I have been rebuilding some brake slave cylinders on my truck, re-sleeving them with brass. I make it a very light press fit and loctite them in.Gold, the colour of choice for the discerning person.
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4th Jun 2016, 10:45 PM #597Banned
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That's because of the copper in Brass. That and iron are the only things that set it off. I could bore you with Anaerobics, but it's not lack of air. Those primers? They aren't solvent, they contain copper.
I bought my missus a Loctite Ion, for mothers day no less. But I joke.
That's why plumber's haven't taken up Loctite. It sets up too quick with brass.
Regards Phil.
(On edit) Even managed to find an AU reference. Please see Q8. Machinery Adhesives Frequently Asked Questions - Henkel
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5th Jun 2016, 09:37 AM #598Pink 10EE owner
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So copper must send it off quicker then steel. Issue I had with these cylinders was they are closed one end and have no nice flat area on the end to press against to put the sleeve in.
They are done now though.
20160605_075644.jpgGold, the colour of choice for the discerning person.
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5th Jun 2016, 03:27 PM #599
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5th Jun 2016, 07:31 PM #600Diamond Member
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Grahame I think that you would be O.K. doing that, that is if I understand what you are wanting to do. In my experience loctite does not go off instantly with copper alloys, and your job if I have it correctly is a quick screw on with a small part, and not something which would take you any significant time to get done. .RC.s job was more fiddly because of the shape of the workpiece not making it easy to press into the housing before the loctite went off. You may even be able to slow the reaction by cooling the parts down in the freezer beforehand,but that is something I have not tried myself, just a hunch that it may help.
Rob