Here is a list of all the postings Jon Gibbs has made in our forums. Click on a thread name to jump to the thread.
|Thread: Stripped T bolt|
Just shows that we're all different.
...but perhaps after you've had your t-bolts a while you might see the problem.
To be fair though it's only the inboard one that is the swarf & chip magnet and then it's worse again when it's on the headstock side. I think that the older models with red knobs and rods on the half-nuts have t-bolts and nuts, whereas the cast levers have bolts and t-nuts - see http://www.lathes.co.uk/myford-ml7/index.html
Edited By Jon Gibbs on 20/04/2016 23:43:18
I hope I'm not teaching my Grandma here but...
My old ML7 had t-bolts and nuts but I got fed up of swarf and chips getting embedded in the exposed threads and between the nut and the thread when undone and retightened. This led to the threads getting worn and stripped very quickly.
So I swapped to a t-nut and bolt from the top which naturally stays much cleaner because the exposed thread is naturally better protected.
Not sure if this is helpful
|Thread: Magnetic centroid|
Cat's eye description here... **LINK**
|Thread: Cutting worms with less tpi than lead screw|
Do you mean a mandrel handle?
Otherwise how do you guarantee 5TPI?
[Edit: Oh, I think I see now - Doohh. Is the idea to drive the spindle from the leadscrew? - thanks]
Edited By Jon Gibbs on 13/04/2016 10:03:24
|Thread: Magnetic centroid|
There is no need for the vehicle to be ferrous-based to trigger such an upside down metal detector in principle since any metal object will have eddy currents induced in it by the fluctuating magnetic field around the coil which either changes it's impedance or the magnetic effect of the eddies can be sensed by a receiving coil.
[Edit: Sorry I just saw Michael's link and it is confirmed... "The ferromagnetic effect increases loop inductance. However, vehicle-induced eddy currents decrease loop inductance even more. Therefore, net effect is decreased loop inductance when a vehicle passes through the detection zone of an inductive loop."]
My old Dad used to have a very crude metal detector in the late 70's when I was a kid and we spent all of our time digging up old drinks can tabs, which were aluminium of course and before they had to be captive.
It'd also be a pretty pointless hobby if all you could find were ferrous rusty blobs and no prospect of gold or silver coins although I don't remember us finding anything other than the drinks can tabs
Edited By Jon Gibbs on 13/04/2016 09:47:52
|Thread: 'Modifications' banned|
I think it all depends if you're someone who feels that more and more legislation and regulation is the best way to improve anything.
Sam, you obviously feel that it is, at least in the case of Building Regs, but personally, I don't.
Without proper enforcement I think that the vast majority of the new laws and regulation just become an unnecessary burden in time and money for the conscientious law-abiding citizen, who wasn't really the target in the first place, and doesn't address the underlying problem or problems. There are numerous examples.
My point earlier on in the thread is that enthusiasm for legislation and regulation is not just a failing of EU legislators but HM Government too.
I understand that the problem in Edinburgh is a lack of ties which sounds more of an execution and building regs issue to me than a design issue but I'll bow to your superior knowledge.
Jon Gibbs MIET SMIEEE
Yes, but don't worry it's registered, there is a paper-trail and it probably cost you a sight more than it would have done before Part P came into force for the same work done to the same standard
Hmmm - They're obviously working... **LINK**
My gripe is really only with Part P. It is only this part which prevents otherwise perfectly safe work being conducted by competent but "unqualified" people.
IMHO pretty much all politicians are clueless. A tiny proportion of them have any experience of the real world or real people's problems.
The whole EU debate centres around which band of "clueless politicians" should be in charge, or have the sovereignty over our affairs, and the various newspapers have their own favourite band of clueless politicians they can "manage" or more likely "knock" in order to sell more newspapers.
...because the views it espouses are considered by many to be small minded and parochial perhaps?
It's old but still funny...
Of course our own domestic politicians, the folks the DM would have solely in charge one presumes, would be completely immune from coming up with such ludicrous policies
Building Regulations Part P?
|Thread: Material source needed|
I'm assuming you've tried cheap plug-cutters?
This style starts very easily without wandering and they're pretty cheap.
This picture may help you to make your own if you go down that route...
Edited By Jon Gibbs on 30/03/2016 14:02:00
|Thread: Low speed grinder or standard for lathe tools?|
I have a slow speed grinder and find the extra "thinking time" very useful for freehand grinding. I'm not sure the slower speed makes that much difference for jig-based grinding though really.
I do use white AlOx wheels in preference to grey carborundum wheels though, although my grinder gets used for other tools than just metalworking.
|Thread: ER Collet|
+1 for Michael's comments. If you have a 4-jaw chuck you'd be much better off with a 4-sided block held in that. Your accuracy would then only be limited by your indicator precision and your patience.
Here they are... **LINK**
I hate to pour cold water on this idea but, having made a few ER collet chucks for my lathes, the hardest part by far is getting the internal thread to fit the lathe nose with sufficient precision. The internal taper and the external thread with the embryo chuck screwed onto the nose thread are then a doddle by comparison and pretty much guaranteed to be concentric - especially if you follow HH's instructions.
+1 for buying your nuts though
Edited By Jon Gibbs on 22/03/2016 09:01:49
|Thread: Ferrite rings|
You might have luck with RS here...
|Thread: Quick Adjusting Drill Depth Stop for RF-20/25 Mill?|
Thanks very much for the ideas and suggestions.
I decided to follow Muzzer's recommendation in the end combined with a new M8 threaded rod. The old 1/2" one didn't leave enough space behind for the thread disengagement and spring and M8 is plenty rigid enough for a depth stop IMHO.
I haven't done anything about a scale yet but a cut-up cheap 6" steel rule glued to the front of the mill and a pointer joined to the threaded rod should be a lot more accurate than the original riveted to the threaded rod.
Many thanks again
Does anyone have any neat ideas for a quickly adjustable drilling depth stop on a round column RF-20/25 mill please?
The 2 lock nuts on the 1/2" x 20 TPI threaded scale take an age to adjust and aren't thick enough to make into tilt-nuts. I suppose I could make two new thicker knurled tilt-nuts but if anyone has any better ideas they'd be very much appreciated please.
There is very limited space behind the threaded scale because of the quill-lock handle otherwise I had wondered about a sprung push-button lock engaging from the back onto the thread.
Many thanks in advance
|Thread: Edge Finder|
It's a real shame that there has been so much criticism of the book here. I really enjoyed it and appreciate the time and effort that went into writing it. At £7 a time HH's hardly living it up on the Costa del Sol on the proceeeds I'll be bound. Incidentally I'm also a huge fan of HH's website as a go-to resource for all manner of stuff.
I'm with Neil though, and welcome project descriptions in a book such as this as a means to learn new skills and acquire new tools and tooling.
When I bought my mill I bought the two HH books on offer; "Milling a Complete Course" WPS #35 and "The Milling Machine and Accessories, Choosing and Using" WPS #49.
The newer book #49 is more up to date and glossier. It is also a more a "How to" guide with fewer projects which may appeal to the "non-projecters" whereas #35 has more projects as the OP says. So, I'd suggest buying the book you think matches your style best but unless you can and are prepared to write a better one then... .
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