The Craftmans Shop > New from Old
The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
awemawson:
So this morning I found a bit of time to start pulling the 90 degree VDI40 powered tooling holder apart. Everything was rather tight with two dowels refusing to let go for a long time. It wasn't until I was nearly there that I discovered that they were drilled and tapped M4 for a slide hammer to extract them which would have been so much easier !
The main issue is the needle roller bearing that supports the input shaft - coolant has obviously entered and it has rusted up.There is an outward facing seal that presumably is the original problem having failed, but at the moment the seal and needle roller bearing are resisting extraction using my slide hammer bearing extractor, so it looks like a few more days soaking in Plus-Gas is called for.
Sadly this means I cannot yet order up the needed bearing and seal until I can make proper measurements
awemawson:
. . . .then it dawned on me . . I could 'take the waiting out of wanting' (who remembers where that quote comes from ?) by using my 60 ton hydraulic press.
Although from the rear the bearing doesn't expose anything to press against, the slide hammer bearing gripper when engaged presents the end of it's three fingers, against which a bar could be pressed.
After that it was no contest and out came the needle roller bearing and seal without even a squeak and the press didn't raise a sweat :clap:
. . .so clean up, measure and order hopefully this afternoon :thumbup:
awemawson:
So having ordered up the Needle Roller Bearing and three seals, and having failed to find an 'O' ring 42 mm i/d x 46 mm o/d so 2 mm cord (if anyone knows a source please tell me) rather than twiddle my thumbs I decided to sort once and for all the interference between the mounting face of this device and the central swarf guard on the turret itself.
You may recall that the options were to modify the swarf guard, to modify the tool mounting face, or to mount the tool on a stand off washer and extend it's drive. As the carcass of the tool is now completely dismantled I could check what would be affected were I to slice a bit of it's base off to accommodate the swarf guard, and the answer is NOTHING that I care about :thumbup: Someone in the future putting it on a genuine Baruffaldi Turret might be a bit hacked off but the cut off bit has no function on the Beaver turret.
A tentative touch with a file showed me that it was mighty tough stuff, but machinable. I had feared that I might have to grind it, but M42 HSS coped OK at low feeds and speeds.
The swarf guard is a nominal 3 mm thick so I needed to remove 3.5 mm of thickness from a 2.5 mm x 5.0 mm area. But first I needed to sink the counter bores for the mounting cap screws by the same 3.5 mm. All went reasonably well, and after a bit of de-burring it's now ready for the bearings and seals and re-assembly.
So far it looks like the risk of buying a seized one might pay off - £24 for bearings and seals - with shipping the three tools (all seized!) were $272 so about £70 each. So about £100 all in for this one. A new 90 degree VDI40 ER32 power tool is pushing £2000 and working ones go for the wrong side of £1000 :bugeye:
OK mucho time spent, but that's the fun part :clap:
mc:
--- Quote from: awemawson on November 28, 2018, 12:31:19 PM ---having failed to find an 'O' ring 42 mm i/d x 46 mm o/d so 2 mm cord (if anyone knows a source please tell me)
--- End quote ---
Simply bearings have nitrile - https://simplybearings.co.uk/shop/p80828/2mm-Section-42mm-Bore-NITRILE-70-Rubber-O-Rings/product_info.html Viton - https://simplybearings.co.uk/shop/p513418/2mm-Section-42mm-Bore-VITON-Rubber-O-Rings/product_info.html and EPDM - https://simplybearings.co.uk/shop/p84828/2mm-Section-42mm-Bore-EPDM-Rubber-O-Rings/product_info.html
Certainly not the cheapest option, but when you only need one or two, it's cheaper than buying a big bag.
awemawson:
odd that, they were my first port of call :scratch:
... correction - no it was Bearing Boys I went first :bang:
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