SillyOldDuffer | 20/01/2023 11:53:24 |
10668 forum posts 2415 photos | I'm not against old-chestnuts coming up repeatedly because it's in the nature of an internet forum - a bunch of like-minded folk chat in an electronic club. What we typed yesterday, let alone last month, is easily missed by anyone other than regulars, sadly regular readers are bored by repetition. Taking the rough with the smooth, I put up with that, seeing the forum as a way of helping others, even though the same subjects come up over and over again. The forum is brilliant at answering questions but it's a poor look-up reference, even when the user has super Google-foo skills! Wikipedia is a much better reference, but it doesn't allow questions. If Model Engineers were more organised, we would get the best of both worlds by producing peer-reviewed Wikipedia articles on subjects like levelling and lathe alignment, with links to this forum and others, where people could go for Q&A help. Unfortunately most of what I know about machining is self-taught. In the absence of Model Engineering information on the web, I read, misread, and misunderstand my random collection of engineering books. Many, many times, I've only understood what a book meant after the point was discussed on the forum. Thanks everyone! Dave PS on the subject of casters, I wouldn't unless mobility was really important. The problem is they reduce rigidity - the lathe will vibrate much more on casters than if it were bolted down on a concrete floor. But engineering is all about compromise. I move my lathe with an engine crane, and it's a right pain. If I had to move it frequently casters, with brakes, and even better jack-stands, would be fitted!
Edited By SillyOldDuffer on 20/01/2023 11:58:31 |
Spurry | 20/01/2023 13:03:12 |
227 forum posts 72 photos | Some good points made there, Dave. Probably picked what I have learnt, the same way as you. My only disagreement would be with the wheels on a lathe. Almost everything I make or use has wheels...it's probably an age thing. The wheels possibly could make the lathe less rigid I guess, but if it ever caused a problem, there would have to be a re-think Still, it's been Ok for 38 yrs so far. Pete |
Hopper | 20/01/2023 21:38:08 |
![]() 7881 forum posts 397 photos | Posted by Michael Gilligan on 20/01/2023 11:22:06:
May I suggest that page25 of Schlesinger’s masterwork should be required reading for all participants in the next discussion ? Here’s an extract, in a handy form to keep: . We can then all jump-in at one of five places, and opine as we see fit. MichaelG.
Schlesinger's work is for machine tool manufacturers, not home workshops. Makes a simple job harder for the average bodger. |
old mart | 20/01/2023 21:47:24 |
4655 forum posts 304 photos | Casters to move it about, but not while in use. Some sort of jacking when in use would help with stability, especially if the jack screws were in front and behind the bed. Lathes are top heavy and not very deep sectioned front to back. |
Michael Gilligan | 20/01/2023 21:49:27 |
![]() 23121 forum posts 1360 photos | Posted by Hopper on 20/01/2023 21:38:08:
Schlesinger's work is for machine tool manufacturers, not home workshops. Makes a simple job harder for the average bodger. . Page25 is about refurbishment MichaelG. |
Neil Lickfold | 21/01/2023 03:39:43 |
1025 forum posts 204 photos | Mine has 4 castors, but when retracted, it sits on the floor in 3 places. Works a treat.
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Pero | 21/01/2023 03:48:00 |
193 forum posts | What on earth is Schlesinger doing using a spirit level? I thought that was verboten! I find a pair of winding sticks ( as taught by my woodworking instructor many decades ago.) to be much more satisfactory. For our purposes these can be as simple as two good quality rulers. In use, set one on edge across the lathe bed at each end. Sight along the lathe bed and any twist will become immediately apparent and can be adjusted out. This method is remarkably accurate ( assuming your sight is OK ) and It doesn't matter whether the lathe is sloping end for end or front to back. This technique will still work. Pero |
Michael Gilligan | 21/01/2023 04:27:36 |
![]() 23121 forum posts 1360 photos | |
Hopper | 21/01/2023 04:59:12 |
![]() 7881 forum posts 397 photos | Posted by Pero on 21/01/2023 03:48:00:
What on earth is Schlesinger doing using a spirit level? I thought that was verboten! I find a pair of winding sticks ( as taught by my woodworking instructor many decades ago.) to be much more satisfactory. For our purposes these can be as simple as two good quality rulers. In use, set one on edge across the lathe bed at each end. Sight along the lathe bed and any twist will become immediately apparent and can be adjusted out. This method is remarkably accurate ( assuming your sight is OK ) and It doesn't matter whether the lathe is sloping end for end or front to back. This technique will still work. Pero And if you use three foot rulers it would be even more accurate. Although you might have to allow some for sag over that length, but as both would be the same, alignment should be unaffected when you think about it. Two long pieces of ground tubing would be ideal. Motorcycle fork tubes would be perfect. One on each end of the bed and take a sighting along the ends. Edited By Hopper on 21/01/2023 05:00:21 |
Michael Gilligan | 21/01/2023 09:11:02 |
![]() 23121 forum posts 1360 photos | Flashing-back to Pete Rimmer’s post … it becomes obvious why this matter will never be laid to rest. The two ‘sides’ hold such different views, and much of World History has been driven by ‘Religious’ Wars. MichaelG. |
Hopper | 21/01/2023 10:47:08 |
![]() 7881 forum posts 397 photos | Posted by Michael Gilligan on 21/01/2023 09:11:02:
Flashing-back to Pete Rimmer’s post … it becomes obvious why this matter will never be laid to rest. The two ‘sides’ hold such different views, and much of World History has been driven by ‘Religious’ Wars. MichaelG. Afraid I fail to see the parallel at all. Pete Rimmer is reporting his personal experience, measured objectively with a dial indicator, as someone who got out of the armchair and did something relevant to the topic under discussion. |
Pete Rimmer | 21/01/2023 10:51:45 |
1486 forum posts 105 photos | I thnik that the reason it will never be concluded is because people work to limits and standards that they find acceptable to themselves. Perhaps through informed choice, apathy, lack of experience/understanding or any other reason. If your lathe is turning out parts that work for you and make you happy then why put more effort in? BTW I also had my Eagle surface grinder on casters. The casters were fixed to a 12mm thick square steel plate and the grinder on top of that. I used to wheel the grider out of the corner, do some grinding and then push it back into the corner to save space. I figured that since the grinder had a chunky square base and single column, it would not be affected by this. One day I was part-way through grinding some part or other, I had to stop and move the grinder on it's casters to get access to something. When I went back to grinding the whole grinding pattern had changed. Now, I have the machine fixed in it's position on the solid floor.
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Robert Atkinson 2 | 21/01/2023 10:56:17 |
![]() 1891 forum posts 37 photos | My fairly recently aquired ML7 came on an original Myford stand that had been fitted with casters. It also came with a small "speed jack" and two blocks. The jack is 1" square tube formed in a unequal U with two small wheels at the corner and a notch in the end of the short arm. It fits under the end of the stand from the front. The bottom edge of the stand end panel fits in the nottch and lifts it enough to get the block under that side front to rear. Lower onto block and repeat for other side. I'd like to claim it was my idea but it was the previous keeper of the lathe. Robert G8RPI |
ega | 21/01/2023 11:26:41 |
2805 forum posts 219 photos | Are castors going the same way as drawers? |
John Haine | 21/01/2023 11:30:41 |
5563 forum posts 322 photos | Did they used to be drawors? |
John Haine | 21/01/2023 11:33:40 |
5563 forum posts 322 photos |
Seems to be the transatlantic divide at work. |
Hopper | 21/01/2023 11:41:38 |
![]() 7881 forum posts 397 photos | What I'd like to know is how do they squeeze the oil out of them to make Castrol R? |
Martin Kyte | 21/01/2023 11:41:44 |
![]() 3445 forum posts 62 photos | Posted by John Haine on 21/01/2023 11:30:41:
Did they used to be drawors? Should they more properly be called draws in cabinetry. regards Martin Edited By Martin Kyte on 21/01/2023 11:42:21 |
Michael Gilligan | 21/01/2023 11:42:07 |
![]() 23121 forum posts 1360 photos | Posted by Hopper on 21/01/2023 10:47:08:
Posted by Michael Gilligan on 21/01/2023 09:11:02:
Flashing-back to Pete Rimmer’s post … it becomes obvious why this matter will never be laid to rest. The two ‘sides’ hold such different views, and much of World History has been driven by ‘Religious’ Wars. MichaelG. Afraid I fail to see the parallel at all. Pete Rimmer is reporting his personal experience, measured objectively with a dial indicator, as someone who got out of the armchair and did something relevant to the topic under discussion. . My point was that, at one extreme, Pete can demonstrate that a substantial lathe will twist enough to be significant, yet at the other extreme you and Pero are discussing checks with winding sticks. Presumably your closing line is intended as a personal insult. … Whereas my opinion has always been that there should be room on a forum for people to express an opinion from any perspective: It’s how we collectively learn. MichaelG. . Edit: __ corrected a typo Edited By Michael Gilligan on 21/01/2023 11:46:11 |
SillyOldDuffer | 21/01/2023 12:37:41 |
10668 forum posts 2415 photos | Posted by John Haine on 21/01/2023 11:33:40:
Seems to be the transatlantic divide at work. Not according to my Shorter OED. Caster and castor have been valid alternative spellings in British English since the 17th century. The dictionary suggests 'castor' may have started as the preferred spelling when used in instruments, but the spellings rapidly became interchangeable. As usual a number of meanings, my favourite: Castor is an oily, brown, odorous substance obtained from glands in the groin of the beaver. Dave |
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