What lathe

[Joshua KempsterParticipant @joshuakempster]

I only have the old fashioned spring power rifles I’ve been messing with them for ever. Modern pcp pre charged pneumatic rifles hold magazines up 20 ish getting up to 300 shots per air fill. The legal limit is set to under 12 foot pounds but if you have a firearms certificate you can buy something like a daystate wolverine which would go up to around 7 times mor powerful for hunting. But as I said I’m a target shooter so less is best

[Joshua KempsterParticipant @joshuakempster]

You use a scuba tank to fill them

[Niels AbildgaardParticipant @nielsabildgaard33719]

Posted by Joshua Kempster on 23/01/2021 11:16:07:

the idea was to get quite good on the lathe an mill so in the end I can machine small parts out of titanium ie the moderator an safety catch and other bits.

 

Tianiumswarf is not for beginners.

Difficult to machine and impossible to stop when it burns.

Start learning with stainless steel.It does not ignite easily

Edited By Niels Abildgaard on 23/01/2021 11:54:53

[Howard LewisParticipant @howardlewis46836]

Joshua,

I have never seen such an exchange on the Forum, and it it sad to see you needing to be chastised

I fear that you have done yourself a lot of damage, some of which may not be recoverable..

You have given me the impression that your ambition vastly exceeds your knowledge, skill and your preparedness to be guided by others.

I suspect that at least some of your machining problems could be ascribed to operator error.

We all started out knowing little, but learned from others.

Howard

[Joshua KempsterParticipant @joshuakempster]

As I say I’m a novice an there is probably some truth to that

[Joshua KempsterParticipant @joshuakempster]

This is a msg explaining what happenedk so being completely new to it I bought ml7 loads of gears broken but a good machine. When I got ok using it I moved on to thread cutting, watched a few vids an started. When going to engage the bk gear it was seized so I removed an inspected an came to find the vee pully assembly had been locked in with a large grub screw. So obviously I’m now stripping this down which was a challenge lol and while doing this realises it was knackered as well as the spindle so after rebuilding the whole shaft at great expense I put it bk together an it was cutting so I ordered a load of gears an a fixed steady an 2 new belts . Well belts came an it was a nightmare getting the top vee pully out as that was grubbed in with rounded grubs so hours later put the new belts on an realised because of the motor size I couldn’t tension the belts. Anyway I’d had enough now an sold it an got the db8vs which popped a fuse straight away on start up then again 10 mins later changed that an the board popped not even really using it. Took it back got it replaced an the new one wasnt cutting in the same place consistently on inspection realised that the lead screw was shifting under the force of me turning the carriage wheel so I looked to see if it was fixable and it wasn’t so I knocked up a collet with a m6 grub in it an fixed it to the lead screw an it was cutting then but it was a botch I couldn’t live with at1200 mate. So that’s the story lol an that’s why I was getting frustrated on the posts

[Mick B1Participant @mickb1]

Posted by Niels Abildgaard on 23/01/2021 11:53:48:

Posted by Joshua Kempster on 23/01/2021 11:16:07:

the idea was to get quite good on the lathe an mill so in the end I can machine small parts out of titanium ie the moderator an safety catch and other bits.

 

Tianiumswarf is not for beginners.

Difficult to machine and impossible to stop when it burns.

Start learning with stainless steel.It does not ignite easily

Edited By Niels Abildgaard on 23/01/2021 11:54:53

Titanium ain't so difficult so long as the tool is really sharp. I think it's the toughness that causes quite a bit of heat to be generated separating the swarf from the parent workpiece. Occasionally I've had a tiny but very bright spark fly into the tray, but never any continuing burn. I think you'd have to be cutting quite a bit of metal, fast, and on a high-powered machine to get into real trouble.

I run slow and cut light, sometimes with a bit of WD40. Arguments sometimes on here that it's not the best lube, but it's available and it works.

Edited By Mick B1 on 23/01/2021 12:30:03

[Joshua KempsterParticipant @joshuakempster]

Yeah that was my thought so I got a load of aluminium to get right on my plan mate

[Joshua KempsterParticipant @joshuakempster]

Yeah that was my thought so I got a load of aluminium to get right on my plan mate

[Joshua KempsterParticipant @joshuakempster]

Yeah that was my thought so I got a load of aluminium to get right on my plan mate

[Tony Pratt 1Participant @tonypratt1]

Joshua, so at present you have no lathe & are asking advice as to what to buy?

Tony

[Joshua KempsterParticipant @joshuakempster]

Correct I now in retrospect liked the myfords but didn’t like messing with gears. I also liked the db8vs but found it lacked in quality control and that electronic board an motor set up was in my opinion a bit toyish

[Joshua KempsterParticipant @joshuakempster]

So I’m currently looking at a boxford

[Tony Pratt 1Participant @tonypratt1]

Joshua, you have now arrived at the position most of us faced at one time or another, I had a super 7 for years which is now with my son, an excellent quality product but limited in capacity. I went for a Warco 290V lathe, so much more capable than the Myford but rough as old boots in places. Your choice as always is old British/American/European iron or new Chinese products, both have their good & bad points!

If pre loved, condition is key as you have found out so if going down that route again you must see the lathe in the flesh, if you don't like change gears & who does get a screw cutting gearbox.

There are loads of threads on this subject but no easy answers.

Tony

Edited By Tony Pratt 1 on 23/01/2021 12:46:41

[Joshua KempsterParticipant @joshuakempster]

Yeah that’s exactly where am at

[Joshua KempsterParticipant @joshuakempster]

What about a proxxon pd400 any one got one?

[Robert ButlerParticipant @robertbutler92161]

We thought you required a gearbox?

Robert Butler

[Joshua KempsterParticipant @joshuakempster]

Like not essentiall mate

[Former MemberParticipant @formermember12892]

[This posting has been removed]

[Joshua KempsterParticipant @joshuakempster]

That sounds ok I’ll look now

[not done it yetParticipant @notdoneityet]

As to the PCP air guns, one can get about 100 (accurate) shots from the normal 200 Bar bottle on the gun. One can charge the gun either by a manual pump or from an air bottle (not all firemen go scuba diving🙂 ).

The 100 shots is usually achieved by fitting a regulator (or buying a gun which has one already fitted). One generally achieves a higher pellet count with a 0.22 caliber, at the legal 12 foot pound limit (16 Joules), than a similar 0.177 gun.

The Air Arms S410, I use at the range, gives about 70 shots maximum, not all of which are at the best part of the pressure band for accuracy. 195-115 Bar, with those above 180 and below 125-130 decidedly of poor consistency or drooping trajectory. The Air Arms S200, that my wife prefers to use, is far noisier than the much heavier S410 I use. The S410 has a sound moderator but there is not one fitted to the S200 she uses. It is certainly not deafening, but certainly would be more noticeable in a vermin control situation. It is loud enough to make ear defenders worthwhile/sensible at the range.

The S410 totes a magazine holding 10 pellets; the S200 can be fitted with a 10 shot magazine but is a single shot gun (magazines are not permitted in competition shooting, I believe). Both are capable of blasting the bull from a target with ten pellets, leaving a single hole (a little larger than a single pellet hole with the 0.22) at 20m.

There are guns which are well out of the range of the average for PCPs, but I’ve not seen one (yet) with a 30 shot magazine (they do exist – but probably only for ‘plinkers&rsquo.

[Joshua KempsterParticipant @joshuakempster]

S410 is a lovely rifle

[VicParticipant @vic]

The problem with most ML7’s is that they have a bore too small for working on airgun barrels. I have a modest 8 x 14 lathe and it has a more useful 20mm bore.

I only have a bit of experience with FT guns and they generally have a 200 bar cylinder which gives around 100 shots with a reg set to about 60 bar. I think the Walther’s had 300 bar cylinders which may have given more shots but as diving cylinders only go up to 300 bar filling them up to full capacity could be a problem.

I don’t know if it’s true but I was told the legal limit is effectively just under 12ft lbs. If you’re caught with an AIr Rifle that when tested achieves 12ft lbs that’s a court case. For Pistols it’s only 6ft lbs. Most FT shooters try to ensure their rifles are safely under the limit. If you leave a legal PCP in a warm place in the summer for example though it can easily go over the limit, I’ve seen it happen.

I’ve made parts from 99% commercially pure Titanium without too much problem with sharp HSS tools but as said if you let it rub it catches fire pretty easily BTDT. Ti6Al4V seems to be commonly available but I’ve found it tougher to machine.

[Joshua KempsterParticipant @joshuakempster]

I think it’s the co2 rifles that go up in the heat but you could be right I ft 22 springer class I run mine at around 10.5flb for accuracy it lowers the recoil

[not done it yetParticipant @notdoneityet]

Projectile weight is also a factor which may give over-the-limit results if the gun is adjusted to be very close to the limit.

Limit was 12 foot Pounds but possibly they now use the SI unit and have rounded it to 16?

Recoil is exactly the same for any system – the only factors being mass of gun and the mass and muzzle velocity of the pellet. The difference with springers is the inertia of the spring/piston which causes apparent opposing forces before the pellet exits the muzzle. Momentum must be conserved – it is a Law of Physics.

’Dieseling’ springers will easily produce muzzle velocities exceeding the speed of sound but it neither improves accuracy nor the health of the gun – apart from breaking the law, of course. ‘Washering’ the spring used to be a common method of ‘up-rating’ a springer (before the laws were applied quite so forcefully).

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