|Boiler Bri||11/06/2019 21:48:36|
812 forum posts
|58 forum posts|
bought a series 2 bridgeport special today complete with collets, vice, rotary table and 3 axis DRO . its a big heavy beast ! the table feed and DRO are 110 volt so no problem, will let my sparky mate worry about the 3 phase- single phase wiring. gary
|Mark Rand||12/06/2019 22:57:04|
|802 forum posts|
Finally used the riser that I made for the Beaver milling machine on the job that I'd made it for. I'd screwed up when scraping the ram ways for the shaper and got them 3 thou out of square with the vertical ways that I'd scraped first. I was so annoyed with myself that I decided to make the raising block and machine them square before re-scraping them .
Shimmed the shaper body so that the vertical ways were vertical with respect to the X feed using a DTI and a precision square clamped to the vertical ways and made the horizonatal ways parallel to the motion. Then milled the ways. The scraped surfaces of the ram print up nicely against the milled ways when blued, which is promising.
Photo picks up the scraping nicely .
|Nigel Graham 2||14/06/2019 10:50:42|
|445 forum posts|
Yesterday actually, but the log-in routine on this site was being especially obstinate!
Ordered, after a good deal of shopping around, the worm and wheel for my steam-wagon's steering-gearbox. I don't know what was actually inside the casing showed in rather low detail on the archive photos of the original.
It's actually the corresponding gearing for an M.J. Engineering 3"-scale Fowler.
With a copy of the wheel & worm's drawing kindly e-posted to me, I started designing the box itself to resemble the prototype as far as I can discern from the photos - so in spirit more than precision to something that looks different in each picture anyway.
|Boiler Bri||14/06/2019 20:05:50|
812 forum posts
Finished my steam manifold ready to Silver solder the fittings onto it
should look much better than the 5/8 square block that can with it
Edited By Boiler Bri on 14/06/2019 20:10:24
|John Hinkley||15/06/2019 13:42:28|
772 forum posts
I finished a couple of mods to my simple indexer today. I've made up a mild steel plate the same dimensions as the base plate and fixed it to the indexer so that I can use it on the surface grinder. ( The original base plate was aluminium - 'cos I had some! ) The idea was to use the indexer as a rudimentary form of cylindrical grinding arrangement while amassiing the material for the real thing. Also to grind the points of the engraving cutters for the secondhand engraving machine that I recently purchased. The detent screw locating the reference plate is released and the machine handle, attached to the outer plate provides the rotation. The pictures say it all, really.
Before anyone comments - the pictures are posed to demonstrate the positioning of the indexer only. I don't intend to grind on the side of the mounted grinding wheel. I have just received a deep cup diamond wheel for that but haven't fitted it yet.
|Nigel Graham 2||15/06/2019 16:09:50|
|445 forum posts|
At the moment, still recovering from having new knee bearings, (me, not the milling-machine!), the get-up-and-go has gone. It's probably lost in the rapidly-growing thicket that passeth for a lawn / neighbourhood's cats' station of ease.
Still, managed a little more battling with TurboCAD to design my seam-wagon's steering gearbox. The rest is all made - though ball-joints are not quite prototypical.
I believe they were used on cars of the time (1908) but the advertising photos suggests the Hindley wagon used rather crude universal-joints for the drag-link. I did make that pattern, driven by a temporary worm-and-wheel from some salvaged something-or-other, but it introduced a lot of free-play and I replaced it a new drag-link using commercial ball-joints of appropriate size. (I've not thrown away the clevises. Barely use, they might come in handy...)
Looking at my drawing so far, the 3"dia wheel and 1.3" dia worm makes the gearbox look disproportionately wide, and I began to think I'd made an expensive mistake until memory kicked in....
Many early vehicles used worm-and-sector steering, but the sectors were probably made to that shape. However, I once worked for DEK Screen-Printing Machines, whose high-precision products could be used for anything from trade-marks and instruction-labels, to p.c.b. masks. One of these machines used a large-diameter sector gear made by cutting a stock wheel. Careful thought suggested, if it were good enough for DEK...
Now the wheel I've ordered, for a Fowler TE, has a large-diameter boss on one face, and keyway-ed bore of nearly 1". I'm not yet fit enough to exhume the poor wagon from accumulated "stuff" and measure things, but I doubt the drop-arm swings more than about 60 - 70º lock-to-lock, if that. There is enough meat on the Fowler wheel to make it into two semi-circular sectors that can be screwed to flanges, using suitable registers and key, thus greatly slimming the space needed.
The unused half? Cut a keyway in that and store it carefully as a spare.
Now to wind up TurboCAD and investigate...
DEK thrives now as part of ASM, but using the original name as a trade-mark. It concentrates on very high-precision machines that link to others from elsewhere to form assembly-lines mass-producing circuit-boards for computers, portable-telephones etc. These machines are naturally now all-NC driven.
The word "DEK" never stood for anything: the original proprietor, whose prototypes labelled oil-drums and the like, had the vision to invent a snappy name easy to pronounce and of no meaning, in any known language!
My own society (Weymouth & D.M.E.S.) was privileged to have a guided tour of ASM one evening a few months ago, among the club's Winter activities.
|Neil Wyatt||15/06/2019 19:26:33|
16757 forum posts
Did a 'mini restoration' on a bass guitar, a Westone Thunder 1 - well-made and good sounding mid-range Japanese bass from the early 80s, but not worth a fortune. Discovered the lacquer on the badly tarnished brass was very tough - overnight in nitromors required. Three of the seven bridge screws had to be replaced with matching ones - these all went in at an angle - I discovered that the original ones had been sheared off leaving bits behind.
Cleaned the brass up with vinegar and salt followed by brasso, then clean tissue, finished with Windsor and Newton gloss lacquer, meant for 'artworks' - it will come off with white spirit but is pretty tough.
EvoStik 'Grip Filth' wipes worked very well on the wood, especially where the varnish was worn off and teh wood had gone grey. Didn't overdo the cleaning as I want it to look its age.
Before (not my pic):
|112 forum posts|
Hi Nigel Graham 2, I'm afraid you will have to be patient with your knee transplant, your body will be wrestling with the after effects of the anesthesia, the antics of the physioterrorists etc, plus periods of not being allowed to drive your car & irrational fear of the damn things falling out on the floor! However fear not, mine were so crippled with osteoarthritis that the grating noises were audible when walking, having now had both replaced with lots of shiny stainless steel & engineering plastic over the last year or so, a complete transformation, signed off by the surgeon a couple of weeks ago. DO NOT try to rush things, I know people who have had to had them replaced again after undertaking major gardening & building projects, silly. On the bright side, ignoring the editors advice I insisted on imperial replacements so that I can walk for miles not kilometres (joke), bottom line? I have just turned 75 & can now run 300 yards along a sand beach & clear low obstacles without falling on my face, little different to struggling to cover the same distance to the corner shop or walk the dog, workshop never tidier & learned the latin names of every weed in the garden. Final tip, do get a pair of quality knee pads the knees do not appreciate hard surfaces at all. Best of luck Bob H
|Nigel Graham 2||16/06/2019 11:54:11|
|445 forum posts|
Thank you Robjon, for your support & encouragement! Imperial knees - I like it!
By 'eck this site's log-in is so obtuse! I'd posted on the thread about acids, and the result was all my efforts to open this thread to reply kept putting me back there. I had to close the lot right back to the Desktop to make it work properly.
Anyway, yes, I am being very cautious. I can walk reasonable distances now, still on crutches, slowly and carefully.
Our physio- " terrorists " are not that bad at all. They don't force things along but assess your progress, select a menu of exercises and teach you them, then leave you to exercise at your own pace though to recommended frequency, at home for a few weeks before seeing you again.
I was there for the first session a week ago but the phsyiotherapist spotted potential complications and consulted a doctor - up-shot was a thrombosis scan (clear) but also antibiotics for an infection.
Driving? I asked last year, after the first op; and was surprised that the doctors and even more surprisingly, the insurers were quite sanguine about, telling me to leave driving until I was confident I could press the brake-pedal in an emergency stop. One doctor suggested simply sitting in the car in its parking-place, and trying it. Last year I had the operation in March, made a few short local journeys in quiet times in mid-June, and was able to attend the MSRVS Rally in Tewkesbury - I live in Weymouth so about 150 miles each way, but I visited the Rally on Sunday and stayed there overnight, helping the lighter duties in clearing the site. (As an MSRVS member.)
As for Caving and Geology -
Well, I was caving again gently from last August to the weekend before the operation this May, involved in a particular exploration project; but I'll never be able to do the sort of caving-trips I could years ago. And yes, I have worn knee-pads for that, for years, though most progress underground is by walking, not crawling. Geology-club field-trips have largely been out for a long time because Geology makes big steep hills and boulder-covered beaches.
Still, whilst convalescing I've written a couple of articles for my caving club's Journal, one on a related geological topic, so at least I've done some office-chair caving and geology!
Office-chair model-engineering too, still trying to teach myself TurboCAD, including using it in designing the steering-box for my 4"-scale steam-wagon I should have completed years ago. I'm certainly not yet up to standing at a milling-machine, or even at the drawing-board that dominates the dining-room. My only trips to the workshop so far have been to fetch the bird-seed to feed the ravening hordes of sparrows. It's amusing watching their antics - especially the two yesterday trying to make more sparrows!
Meanwhile the garden is becoming very Latinate, to the point the "lawn" will need the electric mower when I am fit enough to use it; but the rain has topped up the ponds via water-butt overflows, so the resident frogs are happy.
|Nigel Graham 2||16/06/2019 19:50:04|
|445 forum posts|
Tried the Trial version of Alibre Atom again, but it knows I have had it before, and won't play. It doesn't tell you till it's all loaded though, and you try to run it!
So, re-visited the training CD bundled with my copy of TurboCAD. Previously I could not make its first exercise work but now realised it was probably for an older edition of TC. This time I succeeded, though still with some odd problems.
Also discovered to my great surprise that although it says "2D CAD" in big letters all over the labels, its exercises actually advance to 3D modelling.
|Joseph Noci 1||17/06/2019 17:15:30|
|550 forum posts|
Engraving Circuit boards again - this time for a direct-conversion VHF SSB/CW receiver I am building ( for tracking animal Radio Collars). The current one I use, also a diy unit, is a bit large and unwieldy while trekking in the desert mountains searching for the Lions...Trying to make one that fits in a shirt pocket...
The current receiver: front is 150mm x 60mm - trying to get to 100mm x 35mm..
Am getting really good results with the small CNC Engraver - the IC in the middle is a microprocessor, with pins spaced 0.5mm apart. Circuit board material is FR4 35um copper clad fibreglass laminate, 1.6mm thick. Cutter is a 30deg D type carbide bit @ 30,000 RPM, and constant depth assured with the floating engraving head. Depth is around 45um
All for a prototype to test before committing to actual PCB...
This board is the control and microprocessor module - RF/AF module to follow..
The engraving bit and floating head;
The floating foot:
|Colin Heseltine||18/06/2019 17:04:49|
|345 forum posts|
Fitted new Nitron shock absorbers and matching springs to my Caterham 7. Although it was built (by me) in 1997 all the bolts came out a dream. The Copperslip had worked its magic. Cleaned up bolts, fresh Copperslip, and loctite as appropriate and hopefully will last another 22 years. Whether i will still have a licence and can drive it then (at 91) remains to be seen, or even if petrol will still be available.
|Anthony Knights||19/06/2019 12:13:34|
|287 forum posts|
I intended to start on a stirling engine project which got shelved 2 years ago, but it wasn't to be. The submersible pump which I use in the fish pond, suddenly started tripping the earth leakage breaker. I suspect this is due to water ingress via the cable inlet as I have checked in the mains plug and also for any cable damage. This has always been suspect, even from new.
I managed to partially dismantle the pump, but don't seem to be able to get the motor out of the top part of the housing. The internet is no help as points me to a new pump, or the manual, which doesn't tell me much at all.
There is a small screw in the top with a rubber washer under it's head. It appears to a vent for the top housing. I have left the screw out and put the pump in a warm place. I will check the insulation readings in a couple of days. I may try some WD40. I all this fails, I will cut the end off the housing. If I can repair it, I can glue it back together and add a bit of fibregass for strength. I know this works because 4 years ago I accessed the faulty bearings on a sealed drum washing machine the same way. If it's not repairable then it was scrap anyway and I'll have to get a new one.
|Nigel Graham 2||19/06/2019 18:03:15|
|445 forum posts|
Does anyone know if a pond pump would work as a suds pump, or whether, as possible, it uses natural-rubber parts that the oil would attack?
I do have a Stuart circulating-pump saved from the skip, but that was made for, and only used for, water. I'm not sure of its type: peering into the outlet, the impeller doesn't look like a conventional centrifugal type.
|Frances IoM||19/06/2019 19:01:40|
|658 forum posts|
|I bought at auction for a very low price a 12V sump oil pump thinking it may be useful in workshop but on reading the fine print it has do not use for water. Not sure quite why but may well be material used for any impeller ?|
|Neil Wyatt||20/06/2019 18:44:03|
16757 forum posts
Water might be too thin for it?
|Nigel Graham 2||20/06/2019 19:13:52|
|445 forum posts|
Possibly, Neil, if it's a gear- rather than centrifugal- pump.
Another reason may be the material used for its bearing. Some plastics are hydrophilic, tending to swell slightly, so though otherwise suitable for low-cost bearings might bind on the shaft.
Or, much simpler, it might contain mild-steel in a combination that would simply corrode rapidly in water.
|Ian P||20/06/2019 19:16:25|
2254 forum posts
Pumps intended for oil are usually lubricated by the oil itself. Types using two meshed gears and the ones with multi-lobed rotors have very close clearances and would not last long in water.
Its usually possible to determine what type of pump you have jsut by looking at the casing shape and position of the inlet and outlet ports.
|Ian Skeldon 2||20/06/2019 19:25:32|
|399 forum posts|
I don't know a great deal about guitars but that bass looks great now you have cleaned it up Neil.
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