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Member postings for andrew lyner

Here is a list of all the postings andrew lyner has made in our forums. Click on a thread name to jump to the thread.

Thread: Knurling Tool for Mini Lathe
17/04/2019 23:41:34

I ordered the eBay tool (scissor type) and it is quite heavy duty. It seems to have some lateral movement but, once the wheels have started to bite, it works fine (so far).

I still don't understand how the system works actually. The feed speed, the diameter of the piece and the pitch of the wheel lines all seem to 'cooperate' to give good diamonds. Is it to do with the lateral movement that the tool seems to allow?

I read one post on this forum that claimed the ratios had to be calculated first etc. etc. but others just pooh poohed the idea.

Thread: Thread locking
17/04/2019 23:34:26

I decided to use simple locknuts and it seems they only need be done up finger tight to keep the bronze domes in contact. The clamp works a treat; very firm and stops the pieces from wobbling even under a heavy cutting load. Once I get the three screws set right, there is no serious movement but the pads just wear a shallow groove - no problem.

PS I really could have done with some of your gunk a few years ago when I had a zoom lens that would move itself whenever it was on a slope. My heaviest grease was no use at all!.

It was cheap and I threw it out, iirc.

Thread: Quick Change tool post advice
16/04/2019 17:34:37
Posted by mechman48 on 05/03/2016 12:21:08:

I have a Dickson clone QCTP ( Bison - steel ) with numerous holders; for rigidity I have my tool post set so that the compound slide is wound back some to allow the holder to sit over the end of the compound slide so giving support to the holder whereby the cutting forces are pushing down onto the compound slide as opposed to having a lot of overhang over the edge of the slide. I also have made a brass knurled locking screw which I keep nipped up on to the gib strip to eliminate any slackness on the compound slide. works well for my machine.

George.

This is a bit of a necropost but it's still relevant and the problem of tools dipping down when they catch is always with me. It tends to go away when I nip up the Gibb strip but that's fiddly, too. Life improved a lot for general stability and chatter when I made up a Saddle Clamp and a similar screw-down of the compound to the cross slide could also help. I'd bet that others must have done something like that too. (There's not a lot of meat in that area though and I wouldn't want to affect the strength.

Thread: Knurling Tool for Mini Lathe
13/04/2019 15:32:59
Posted by jimmy b on 13/04/2019 13:40:34:
Posted by andrew lyner on 13/04/2019 10:35:05:
Posted by not done it yet on 13/04/2019 09:00:23:

He might be living in Australia for all his profile tells us!

I just got back indoors from feeding the kangaroos and read this. Usual sloppy thing about filling in my profile but I do worry about the dangers of this new fangled internet. Risks and benefits, you know. Essex is where I live, since moving back from Wogga Wogga - I really miss those dingos.

That RGD tool in the link does look a bit flimsy and the ones on eBay here, look more substantial and a bit bigger. Has anyone tried one of those? The useful gap seems to be a bit under 40mm, which would be good if it's not too wobbly. It has the right size shank for me and there are extra wheels. The 50mm Warco one looks less substantial from the picture but someone mentioned the problem with relying on pictures.

The Ebay one looks worth a chance

Jim

Edited By jimmy b on 13/04/2019 13:51:11

I decided to go for the eBay one. I'm sure it will be up to anything I want it to do. My Warco Lathe is doing very well but I still have trouble with getting a good finish. Still learning about sharpening tools correctly, though, so I put it all down to that. The quality of my knurling will probably be at least as good as the rest of my work.

Thanks for the views, chaps. thumbs up

13/04/2019 10:35:05
Posted by not done it yet on 13/04/2019 09:00:23:

He might be living in Australia for all his profile tells us!

I just got back indoors from feeding the kangaroos and read this. Usual sloppy thing about filling in my profile but I do worry about the dangers of this new fangled internet. Risks and benefits, you know. Essex is where I live, since moving back from Wogga Wogga - I really miss those dingos.

That RGD tool in the link does look a bit flimsy and the ones on eBay here, look more substantial and a bit bigger. Has anyone tried one of those? The useful gap seems to be a bit under 40mm, which would be good if it's not too wobbly. It has the right size shank for me and there are extra wheels. The 50mm Warco one looks less substantial from the picture but someone mentioned the problem with relying on pictures.

13/04/2019 08:53:13
Posted by David George 1 on 13/04/2019 08:01:53:

Hi Andrew have you thought if going to the exhibition at Doncaster there are always a few goodies to compare!

David

Doncaster's a long way to go, I'm afraid. I may be demonstrating my dilettante attitude to the business but I was hoping to get the benefit of the experience of others from this very useful forum from the comfort of my office chair. I would travel a fair distance to spend a few hundred quid, though.angel

12/04/2019 23:44:30
Posted by XD 351 on 12/04/2019 23:37:08:

I would be a little suspicious of a tool that is half the price of the others , best thing you can do is go to the shop and have a look at it . Check for things like side play in the arms also if the knurling wheels run true and the teeth are nicely formed . Be wary of pictures of the tool as they can be made to make the tool look better than what the tool really is . The side play can cause problems when you want to do a long knurl as it allows the wheels to cock sideways and this can effect the finish . I have a knurling tool that came with my qctp and the wheels have so much run out they are more like little cam lobes than wheels !

You could also make your own tool and buy the wheels .

If only there were those shops around. It would take a day trip to visit any supplier that I know of. Cheaper just to buy blind.

I have made a few bits and bobs for my lathe but there are things I actually want to make with it and I can't be sure enough of my skills to be confident that what I made would be good enough. I could, of course, make it like a tank - as I do with most of my home made tools. No beauty pageant!!! And the materials would cost loadsamoney.

12/04/2019 22:59:21

I realise that I need a clamp type knurling tool for a light weight Mini Lathe and I was wondering what people's experience has been of what's available. You can spend as little as £16ish from Axminster and over twice that from other sources.

I don't do 'heavy work' (well, you wouldn't, would you?) and would be unlikely to be knurling steel. Some names would be a great help. The Indian-made stuff I have bought really looks and feels pretty fair, in general and it would be good to have a UK distributor.

Andrew

Edited By andrew lyner on 12/04/2019 23:01:47

Thread: Old screwdrivers - any use as a materials source?
05/02/2019 21:53:48

That was a fun list of possibilities.

I had, of course, failed to spot how useful the plastic handle could be.
In the light of what's been said here, though, I wonder why they command such high prices on eBay.

03/02/2019 16:19:47

I realise this a 'how long is a piece of spring' question but I have a number of elderly screwdrivers and reviving pozidrive drivers is not easy (I expect).

So should I consider cracking off the handles and make them into punches and other tools? I guess they would need to be hardened and tempered when I have finished messing with them.
It seems a shame not to give the metal a useful second life. There are many 'job lots' of old screwdrivers - Stanley etc. ~It could be a cheap source of metal. They do not go at silly prices so someone has a use for them.

Thread: Thread locking
25/01/2019 09:49:49

@Hopper That looks a nice and meaty piece of kit. I notice it seems to be split in two halves - i guess experience told you that flexibility of use would justify any compromise on strength. My version is much the same shape but uses 8mm plate and M8 nuts. I was thinking that just making the screws 'tighter' would be more convenient than actually locking them but comments from you and other members have convicted me otherwise. I haven't room to put locking nuts 'inside' the circle so I will just use longer screws and lock nuts.

Andrew

23/01/2019 22:28:29

Cheers for the ideas.
I fancy the spring solution for a start. I will root around in my springs drawer and see what I've got.

Andrew

23/01/2019 21:56:26

I have made a steady rest for my mini lathe which has a max diameter of around 60mm and it uses three long nuts and three M8 screws (phosphor bronze pads on the end). It is quite rigid enough but I want to dissuade the screws from turning whilst it's running. I guess they could tighten or un-tighten as a result of vibration.

I am looking for a really thick grease or sticky stuff. I remember many years ago using a very soft Nylon compound for keeping magnetic tuning inductor cores in place. It would do the job fine, I think but I can't think where to obtains it.

I wondered about a nylon grub screw. Any other well known methods for this? Perhaps M8 butterfly nuts to lock the threads?

Cheers

Thread: Difficulty with gears for some thread pitches. (mini lathe)
20/01/2019 17:50:50

Hi Brian

One of those links has a picture of the standard banjo. You can see it takes up a lot of room and it bumps into other bits. There is a protective casting around one of the upstream gears which I think must be to prevent you graunching it when messing about with wheel combinations.
There will be more than one solution for some pitches and, of course, it could require a vast array of wheels to achieve. I must say, I wouldn't have encountered the problem if I had been after a common (M) thread. it just happened that I was looking at the table (an extended one and not the one in the Warco book for the lathe) and I tried a couple that just wouldn't fit. It got me thinking. The 'second' adjusting screw can be a real devil, even for possible combinations.
However, on the whole, I am pretty impressed by just what my mini lathe can do for me. It's the only way I would be getting that facility with the money I want to spend on my DIY stuff. I'd get very frustrated if I was ever working to a schedule, though.

20/01/2019 10:39:51
Posted by Brian Wood on 20/01/2019 10:27:20:

Hello Andrew,

Here are two gear set ups for 0.2 mm pitch threads [127 tpi] which would surely be fine enough with the standard issue gears.

Change wheels A = 30; B = 60; C = 20; D = 80 ---- Pitch equals 0.198 mm with 16 tpi leadscrew

OR A = 20; B = 50; C = 20; D = 60 ---- Pitch equals 0.200 mm with 1.5 mm leadscrew

Regards

Brian

Yeah - I can do the maths but the banjo (far from being a banjo shape) actually gets in the way of many combinations of wheels. The suggested alternatives wouldn't suffer from this, I think.
I'm glad I found this problem at a non critical time as I can think ahead for when I really need one of those impossible pitches.

Edit: So I may even need more than one banjo if I want to do all possible mathematical combinations.angry

Edited By andrew lyner on 20/01/2019 10:42:55

19/01/2019 23:49:31

The thread was for the inside of a telescope extension tube. They put fine grooves in the tubes to disperse any light that hits the sides of the tube. So any pitch and depth would be ok, afaik.

Both those alternatives seem attractive but they are only one point fixing. How is rotational strength? I suppose the answer is 'sufficient'

19/01/2019 14:53:23

I needed a fine but unspecific thread pitch and it appears to be impossible to achieve some combinations of gears because the swinging plate will not allow it. It is annoying me, just after having sussed out the system; the sums are surprisingly straightforward but real life gets in the way.

This must have been a problem for many mini lathe users. Of course there are combinations that are impossible because the larger idler gear can prevent the smaller gear meshing but the swinging idler plate can only swing so far and the straight slot is too short. etc. etc. That prevents otherwise legal combinations.


I guess I could design a replacement to deal with this but my drafting skills are limited and I can see I would end up doing a lot of bodging and filing. (Surely not!!!!)

What's the experience of other mini lathe owners?

Thread: Editing posts and other ideas.
08/01/2019 23:10:09

@Dave

Well dang me - it's OK on Firefox.

Cheers my boy

08/01/2019 23:01:07
Posted by SillyOldDuffer on 08/01/2019 17:54:19:
Posted by andrew lyner on 08/01/2019 17:01:08:
Posted by Neil Wyatt on 08/01/2019 13:50:40:
...

However, easier to try another browser

Dave

Edited By SillyOldDuffer on 08/01/2019 17:55:29

What a good idea. I will try it.

Amazing that I haven't coma across that particular Return problem with any other software. At least, not consciously. There is a sort of problem with some of the 'media' when a Return will launch your post and not go to a new line but I just put it down to a programmer's choice between hard and soft break. At least the result leaves the cursor in a position to type on a new line.

I just did it AGAIN!!!! I will experiment with browsers.

08/01/2019 17:01:08
Posted by Neil Wyatt on 08/01/2019 13:50:40:

I regularly offer my advice on what the 'next generation' forum software should be like.

The return issue seems to have arrived as a result of a change in how apple devices work. It's unlikely to be fixed until we change the system at some point in the future.

Neil

I know that there are differences in the codes but, as I have pointed out, the problem never arises anywhere else and it should really be up to the writer of the (minority) software for the forum editor. Windows, throughout its history, has been littered with this compatibility thing and a lot of it goes back to the DOS Operating System . Apple software has its quirks too and there's been what amounted to hostility between Microsoft and Apple at times. But this Return issue has been solved time after time elsewhere. Cntrl Return does the job for me but it's just an on-going niggle. smiley

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