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23rd May 2017, 10:31 PM #1Golden Member
- Join Date
- Jun 2004
- Location
- Kyabram. Vic
- Posts
- 632
It started out as a 'simple' job.
Like the title says; it was just going to be a simple job to remove the vertical head and set up a horizontal milling arbor to mill 3 slits in a new chuck backplate.
Removing the 150kg or so vertical head is relatively easy. Done.
Next thing then is to clean up an unused by me (but some rough use by others previously) 1" X 40 taper arbor, spacer sleeves and running sleeve . Years of crud and surface rust cleaned up ok, but it has been a shop made taper and is not quite perfect.
Next thing is that the running sleeve doesn't fit the support bush. It is a standard 1 7/8" bush. It appears that it has been turned down to 1 15/16" most likely from a standard 2" version. Why the odd size; who knows.
Next idea is to fit a good 1" X 4mt mandrel to the lathe and turn the running sleeve down. It is hardened, but a file cuts it ok. Mandrel by itself runs straight. Stack the bush and spacer sleeves and there is runout on the outer end of the sleeve; but chuck end is ok. These spacers have been turned and bored on the lathe. Shorter ones had been dry ground on the ends on the T & CG. These sleeves were from .0005" to .003" out of square on the ends. The running sleeve was much worse as well as damaged on the ends. Somewhere around .008" to .010" over both ends to true up. As a result the stack is pushed off square on the mandrel and most likely is the cause of the runout.
Fire up the surface grinder which hasn't been used for a while. Low coolant; so have to lug 45ltrs of fresh rainwater from the house tanks (80 metres away) to top up
the coolant tank.
The commercial sleeves on the arbor are a mess; out of square, damaged by swarf and dinged. So far one has had .008" ground off one end as one side appeared to have been crushed. So much for precision surfaces.
Back to the grind tomorrow.
Ken (who has almost forgotten what the original job was)
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23rd May 2017, 11:44 PM #2Most Valued Member
- Join Date
- May 2011
- Location
- Murray Bridge S Aust.
- Age
- 71
- Posts
- 5,959
I've never heard of a simple job, always take me about 3 hours. Now, where did I put that special tool too??????
KrynTo grow old is mandatory, growing up is optional.
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24th May 2017, 10:37 AM #3Intermediate Member
- Join Date
- Mar 2017
- Location
- gold coast
- Posts
- 47
there's a hole in the bucket dear lisa dear lisa.
I think we've all been there. usually love jobs for mate of a mate adding another gear for a Fiat 600. ask me how I know.
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24th May 2017, 02:17 PM #4
Hi Ken,
Sounds like a normal day around here. What mill are you putting the horizontal head on? Don't you already have a Adcock & Shipley, Or are you doing something with the Rossi?
Ray
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24th May 2017, 06:34 PM #5Golden Member
- Join Date
- Jun 2004
- Location
- Kyabram. Vic
- Posts
- 632
ppdmiami.
I found a bucket without a hole for the water transfer.
Ray,
The A&S has had a crash sometime in it's previous life and a plastic cover on the end of the table was badly cracked. Looked like the cracks had been patched with epoxy; but the oil splash from inside caused the epoxy to fail. I cleaned it up and tried the Loctite cyno glue and it worked great for a couple of years, but it also failed in last summers heat. I have stripped off the broken cover and have done a bit of head scratching with it. I was considering milling a new cover from ally billet but with all the different angles; the set ups were going to be a royal pain in the asre. Looking at a jig and Tiging up from plate. Anyway the 8" rotary is too big for the table.
I just lifted the vertical head off the Rossi and set up for horizontal. That's when the rot set in.
Anyway; I finished end grinding the rest of the spacers today. Some equal to my turned ones and others worse. They are all a damn site better now. Even did the nuts; arbor ones that is. Many of the spacers have been hardened and noticably harder than the 1045 I used.
Trial fitted the running spacer and spacers on the lathe arbor and they appeared to go together much nicer. The DTI tomorrow will tell me if I am kidding myself or not.
Ken
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25th May 2017, 01:52 PM #6
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25th May 2017, 07:36 PM #7Golden Member
- Join Date
- Jun 2004
- Location
- Kyabram. Vic
- Posts
- 632
Thanks for the offer Ray. The base and rear end are the mounting points and are about 10mm. The inward angled sides, flat top and front are 4-5mm and a tight fit against the leadscrew.
Ken
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31st May 2017, 08:12 PM #8Golden Member
- Join Date
- Jun 2004
- Location
- Kyabram. Vic
- Posts
- 632
Well that was an anti-climax. 3 x 30mm deep slits in short time in the 10mm thick wall of the 'shank' of a lathe chuck backplate. Hard cast iron. Slitting saw was a second hand used Sutton 6" X 1/16" X 3 TPI with the key slot ripped out in a previous unknown accident. I pass with the full 30mm depth of cut. Arbor a slow 38 RPM and slow hand feed. Blade lube was (rightly or wrongly) spray bottle CRC to prevent binding in the cut.
The reworked running sleeve and precision ground sleeve ends worked a treat. No noticable runout in arbor or slitting saw. No saw slippage with only tight friction drive.
Ken
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31st May 2017, 09:26 PM #9
We all seem to have had the same " it will only take a few Minutes , days later.
Michael
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