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Wallace
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Yes, by the time I realised I had used the screwcutting lever to disengage the feed it started to load up and I couldn't disengage either and did some damage. Upon disassembly I found a previous bodge where it had been done before, still on the to do list waiting for a round 2it.
brightspark
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power cross feed is nice once u have used it ive only ever had one dig in and clipped the chuck once with no damage in 40 years
They did when I was a lad but they tended to be on the larger lathes.Just out of curiosity, do/did they make lathes with powerfeed on the compound slide? It seems kinda pointless but I'd always thought power crossfeed was pointless until reading this.
I don't feel the need for a powered compound, mostly compound use is set over to generate a angle but industry went with copy attachments to generate taper cuts in quantity. I have mine set over slightly from 90deg to the slide (3 deg irrc) because I can make finer adjustments to the depth of cut than the cross slide handwheel allows using it, and the other time is for advancing for depth of cuts at a angle. Most mass metal removal exercises are for holes and exterior diameters parallel to the lathe bed axis. Even for cutting a taper I would rough it in using power and parallel then just finish off the taper cut for the last bit.
Powered tailstock can be nice, some of the cazeneuves I am looking at for my next lathe had that feature both for traverse and feed on their longer bed models but nowadays people run a tooling holder in the toolpost and toolposts themselves are made more rigid to cope. I have a taper holder toolblock for my multifix toolpost but I limit myself to the size I want to stick in there out of deference for my poor old lathe. Id be wary of just sending a morse mounted tool in on something older or less robust as that'd be a recepe for broken out tslots on the toolpost mount or worse, but thats the modern way of thinking apparently and anything less is derided as stupid in certain circles. Abuse your machine as long as it gets the job done.
Powered tailstock can be nice, some of the cazeneuves I am looking at for my next lathe had that feature both for traverse and feed on their longer bed models but nowadays people run a tooling holder in the toolpost and toolposts themselves are made more rigid to cope. I have a taper holder toolblock for my multifix toolpost but I limit myself to the size I want to stick in there out of deference for my poor old lathe. Id be wary of just sending a morse mounted tool in on something older or less robust as that'd be a recepe for broken out tslots on the toolpost mount or worse, but thats the modern way of thinking apparently and anything less is derided as stupid in certain circles. Abuse your machine as long as it gets the job done.
Spark plug
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Talking about a power tail stock, I been thinking for a wile about making a drilling atachment to go on the saddle.
Wallace
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I have worked with a few people like that, always felt they lacked 'mechanical feel' or finesse.
normspanners
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I made a morse taper holder for my big old dean smith and grace lathe it was brilliant for feeding big drills it was good for keeping the drills sharp coz of the constant cut , and being limited on drill sizes especially on big drill's you could drill slightly oversize with it by putting the drill off center.
CRB
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I am not sure I see the point of a powered tailstock spindle, lever or capstan type arrangements would do the trick.
However, having looked at http://www.lathes.co.uk/cazeneuve360/ I definitely want one. It appears to be a very well considered lathe.
?Just a safer, more controlled way of feeding MT3/4 drills?
However, having looked at http://www.lathes.co.uk/cazeneuve360/ I definitely want one. It appears to be a very well considered lathe.
?Just a safer, more controlled way of feeding MT3/4 drills?
Maker
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Very nice
.I must not be the only one who browses random pages on that site
. One of my favourites on there is the Harrington (and not just because that's my surname)
. Oliver make a similar one too.
CRB
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Very nice
I must not be the only one who browses random pages on that site
Wey Eye young Oli Harrington, Your birthday is the day before mine, albeit a few years later.
I have an old Ginger Beer bottle, pottery, with my surname on and it means something to do with 'sugar refinery' in Portuguese.
I do not do random, I prefer the considered A B C approach, do not miss a thing.
Edit, now I have looked at Harrington and Oliver. Loving the Oliver 'sometimes gap beds' and the Harringtons are just huge but with the clever outrigger bits.
All clever stuff, and another reason
to sit here a while longer.
Maker
Most folk just call me; Orange Joe
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My name's Adam, not OliWey Eye young Oli Harrington, Your birthday is the day before mine, albeit a few years later.
I have an old Ginger Beer bottle, pottery, with my surname on and it means something to do with 'sugar refinery' in Portuguese.
I do not do random, I prefer the considered A B C approach, do not miss a thing.
Edit, now I have looked at Harrington and Oliver. Loving the Oliver 'sometimes gap beds' and the Harringtons are just huge but with the clever outrigger bits.
All clever stuff, and another reason
.I see what you mean about the ABC approach but links you've clicked before are a different colour so I still don't miss any.
Just had a thought about those big lathes; if you're facing a big part, as you feed the tool closer to the centre, the cutting speed will decrease, did they ever make some kind of special automatic gearbox to speed up the spindle as the tool gets closer to the centre to keep the surface speed the same?
Edit: According to Wiki, CNC lathes have a thing called CSS, constant cutting speed but did any not-CNC lathes do so?
Not sure about lathes but when I left the game in the early 70s we had 2 Churchill froriep vertical borers that were able to speed up as the cutting tool neared the centre.My name's Adam, not Oli
I see what you mean about the ABC approach but links you've clicked before are a different colour so I still don't miss any.
Just had a thought about those big lathes; if you're facing a big part, as you feed the tool closer to the centre, the cutting speed will decrease, did they ever make some kind of special automatic gearbox to speed up the spindle as the tool gets closer to the centre to keep the surface speed the same?
brightspark
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thats where an inverter speed control drive would come in handy turn it up as u get nearer the center
Maker
Most folk just call me; Orange Joe
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Wow, just googled that
, it's like a vertical spindled lathe, what a beast.You could probably wire a DRO scale on the cross slide to a VFD to do it automatically.
You get the speed advantages but can turn between centres still on the same machine when the occasion demands. Plus imagine being the poor sod on the hbx590 or hb700 with its 2m long bedway and having a job that involves dragging the tailstuck up and down the ways all day.
French lathes are pretty good by and large (cazeneuve, HEB, innovatiosn mechanique, ramo, souma etc) , there was a machine standard (the salmon standard) they had to conform to in terms on rigidity and accuracy derived in the 50's, so subsequently everything ended up with massive headstock castings and solid ways to meet the requirements. The real problem is finding a good one at reasonable money, all the sub 3k ones I've seen look like that harrison boat anchor in the other thread or are ***** old worn out flat belt driven things from the dawn of time.
Spark plug
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But surly as the feed is driven by the spindle as the spindle speed increaces so will the feed, leaving the SFM unchanged. To do this the the feed would need to have a separate drive, so you could vary the feed rate relative to the cutters offset to centre.
