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Thread: Holding down a lathe
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5th July 2015, 09:15 AM #1
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Holding down a lathe
Just purchased an AL336D from H&F.
What's the best way of fixing it to a concrete slab?
mav_walrus
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5th July 2015, 09:56 AM #2
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Is it to be fixed for rigidity or just so it wont move while using.
If for rigidity you may have to strengthen the sheet metal base that it sits on first, this may even entail making your own base out of heavy plate and RHS and then incorporating the foot brake into the frame.
If it was just to stop the lathe moving you may be able to weld some pieces of 50mm flat plate to the base of the cabinet then bolt these to the floor, I would think 4 pieces that are long enough to go under each cabinet base and secure with 8 bolts.
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5th July 2015, 11:50 AM #3
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Was going to bolt it down with 4 x M12 dynabolts per cabinet but was told this could cause vibration problems and I should put rubber pads between cabinet base and floor.
As I want to try to get it dead level I'm concerned about how the pads compress.
mav
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5th July 2015, 12:56 PM #4
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You wont get it dead level bolting it to the concrete anyway.
Trying to bolt it hard down to the floor may twist the lathe cabinet and bed.
Larger machine use jacks to adjust the level to remove inconcistencies.
Best to just fasten it down on the rubber pads so it wont fall over.
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5th July 2015, 01:38 PM #5
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I have an AL340, a slightly bigger version of the AL336. It sits unbolted and unrubbered on a 4" shed slab, I check that the ways are coplanar once a year or so. No problems so far.
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8th July 2015, 08:23 AM #6
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I made some adjustable feet for my AL960B. Used a couple of nuts, a UNF bolt, hardened steel shim on a pice of rubber for the base and a 20mm washer above the bottom nut. Worked a treat for leveling! I had a bit of movement though as its top heavy so I'm in the process if filling the cabinets with lead ingots lol. It's pretty steady now
ImageUploadedByTapatalk1436304192.508646.jpgImageUploadedByTapatalk1436304205.309455.jpg
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8th July 2015, 01:06 PM #7
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I think rubber would be a hindrance to keeping the bed true.
Originally Posted by MOA
I made some adjustable feet for my AL960B. Used a couple of nuts, a UNF bolt, hardened steel shim on a pice of rubber for the base and a 20mm washer above the bottom nut. Worked a treat for leveling! I had a bit of movement though as its top heavy so I'm in the process if filling the cabinets with lead ingots lol. It's pretty steady now
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8th July 2015, 01:28 PM #8
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No there's no hindrance from the rubber under the feet. Its quite hard and not compressible. There's no way you could drive a screwdriver through it. But that's just my setup. For your ideas library
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