Here is a list of all the postings Graham Rounce has made in our forums. Click on a thread name to jump to the thread.
|Thread: Cutting a worm?|
Yes, that's why I was thinking of square-profile threads, which should cause very little up/down bending of the screws? At the expense of more friction, maybe.
Talking of which, Paul Lousick, where can you get round rod threaded with a square profile thread? I hope you didn't mean "square rod", like a rack?
Howard: I haven't worked out all (most of) the details, tbh, but yes, I'm sure a "winch" will be needed.
Andrew: Yes, obviously.
Edited By Graham Rounce on 21/05/2019 01:12:30
Oh. Well, it's just an idea. I'd like to see it in action, even so.
It started off when I saw a basque being tied (zig-zag ribbons down the back). Very decorative, but a lot of trouble! So I was idly musing about some kind of electric assist.
Now even I can think of other, more suitable, things than what I've described above, but I've become sidetracked by the interest of making one, which I haven't seen before.
Hi, and thanks for all the advice, and the terminology info. I didn't know you could grt square threaded rod! I hope we can keep MI5 out of this.
Enc is a pic of what I have in mind. It's supposed to be a compact puller. The two gears at the left cause the leadscrews to turn in opposite directions at slightly different rates, in turn causing the pinion to move along, slowly but powerfully.
I've drawn triangular teeth because it's easier, but square would be better. Steel, probably. If necessary, there could be pinions above and below the one shown, to help stop the screws bending.
In the end, I'd like to make it even more compact - 1/4 the size shown, if that turns out to be possible.
Btw, I just mentioned the woodworking lathe. I don't think it will be of much use for this
Hi. I would like a few wormscrews, say 4" long by 5mm dia, in brass, but all I can find are much shorter than that. Also some spurs with concave teeth so as to mesh as well as possible.
I'm thinking that a piece of threaded M5 won't be ideal, and that a "squarish" rather than triangular tooth shape would be better, to avoid slippage of the spurs.
I've Searched several times for the worms, but found nothing but highly expensive custom-made stuff.
Can you get dies, similar to screw-cutting ones but with a different profile, for making them with?
PS: I only have a woodworking lathe.
Edited By Graham Rounce on 19/05/2019 22:40:57
|Thread: Drilling cast iron - where did I go wrong?|
Can you not clamp a piece of hardwood (20mm?) to the metal before starting the drilling?
Or instead of clamping, drill a couple of 4mm holes for bolts and nuts to keep it in place, if you don't mind an extra couple of holes?
|Thread: Lathe reviews?|
|Hi - Ok! Anyone got any experience of the Warco Super Mini to pass on?|
And PS, just to show off my ignorance, I think 'Maximum swing' (180mm) is the max diameter workpiece it will turn, but what is 'Swing over cross slide' (100mm)? Is it the maximum cuttable diameter?
|Hi David, and thanks - that's a fantastic resource. But I was thinking more of user reviews (of current machines)?|
|I know I can hunt around, but are there any sites that deal with reviews of metalworking lathes?|
Something like this
only for metalwork?
|Thread: Metalworking carriage on a woodworking lathe?|
|Sorry I've been absent, but thanks for all that info & suggestions (and the offer, Bob, but unfort I'm in Bethnal Green, London).|
I'll post pix (eventually) when it's done.
|For my gyroscope project, I've obtained some metal rings (pipe "slices") about 6" diameter and say 1cm x 1cm in cross-section. (I've put a pic in my Album - is it visible?) |
Now they just need a little trueing up
As I don't have the money or the room for a whole lathe, I was wondering... If I bolted just the carriage to my wood lathe, is there any reason why it shouldn't work? I'd have to adjust the feed position by moving the carriage manually and re-bolting, but the X and Y tool movement should be ok?
Among my worries are Vibration (only do small cuts), Inappropriate speed, and Affordability of even a 2nd-hand or surplus carriage.
Is there any point in even thinking about this?
|Thread: Am I living in a different world ?|
|Stub/Neil - Thanks, but obviously I don't want to cloud my opinions with facts!|
No, but seriously, I do. I'll have a look at that website.
|I'm with Clive - A lot of non-profit organisations, it seems, eventually degenerate into being run mainly for the benefit of executives and staff, as I found out recently when I couldn't afford bunk beds in dorms in Swiss Youth Hostels! Expensively designed and outfitted, but unaffordable for the mainly kids-on-shoestrings that they are supposed to be for. From what I saw, they functioned as cheap hotels for those who could afford actual hotels.|
|Thread: What's this officially called?|
|Terry - Yup, that must be the way to go. Thanks.|
Les - That's fantastic. I wish I was as well-directed, quick, single-minded or whatever as him! Most people would count their lives well spent if they successfully completed EITHER of those projects!
|Hi Andy - Past a certain speed the bar is going to bow anyway, but it sounds worth a try - hopefully it won't need to go up to that speed.. Now I wish I had a continuous speed control on the drill press! (Or a less heavy duty one of those amazing machines that garages use for car wheel balancing.)|
Latest: The metal pipe supplier doesn't want to cut thin slices, unfortunately.
|Ian - thanks for all that. I think I'll be using the hopefully precision-drilled-to-3.18mm Meccano bush wheel for the hub - I haven't heard back from him/them yet.|
Any tips for balancing it? I was thinking of "hanging" it with the shaft horizontal, and adding weights or removing metal until it showed no preference for taking up any particular position, but that would be approximate at best...?
|Hi - I was thinking that the tubes would be made to fit together with standard fittings, elbows etc, so would have to be pretty round. Well, one can only try - they may not sell it in 6mm lengths anyway !|
|Michael - Of course I would! I'm not superstitious!|
|Bazyle - Thanks for the drill-aligning tip! Simple when you know, huh?|
In my brain, at least, the project is proceeding apace! - I'm now thinking of trying (if I don't jinx it by speaking in advance) to get a steel pipe supplier to chop off (say) a 6mm thick ring from a 7" dia pipe whose wall thickness is 6mm. This would give me a nice thin but fairly massive ring, hopefully pretty circular that I could either glue to a plywood disc as before or, more ambitiously, attempt to make spokes to a bush, and balance it somehow by attaching nuts & bolts in appropriate places.
Obviously, I do realise that this is making the recent Mars landing look like a sure thing in comparison! Luckily there's no rush.
As for the motor handling the load, my approach is going to be: if it doesn't, get a bigger one! The shaft sticks out a little at the other end, so I guess I could rest it on a little oiled "cup" somehow...
PS - Ian: I'll puzzle over all that, too - I like the idea of aerials as tube sources!
Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!
You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.
Click THIS LINK for full contact details.
For subscription issues please see THIS LINK.