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Member postings for S.D.L.

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

Thread: Help to value a Schaublin lathe.
02/03/2021 22:25:41

I sold one some years ago, Expect 4-500 pounds, more if with good selection of collets or optional slides.

This is a instrument makers lath so will not have many of the features some are talking about.

Ebay or similar with a reserve will probably find the best offer.

Steve

Thread: Washers under nuts
30/01/2021 13:21:34
Posted by Mike Hurley on 30/01/2021 11:18:36:

Personally I tend to use washers most of the time for stuff I'm making, just feel they give a better 'fit' to things. If you study the vast majority of early industrial / victorian engineering they never seemed to use them. Was this because of the extra cost or just considered unecessary? When did they start to become in regular use, and was it one of these trends that started perhaps in America and spread over here or vice versa? Have often wondered. Regards

I suspect that washers every where came from working on costs plus jobs for the MOD in the cold war where if you added washers everywhere on thousands of bits of kit and got cost plus profit it would add up.

Reason for this is everyone iIhave met that worked for GEC, Marconi, BAC etc wants washers every where, and when asked why because there supervisor or manager insisted, never have got a good explanation.

Commercial people I have worked with only wanted them if to cover slots or protect paint etc.

Steve

Thread: What nut and bolt material?
15/01/2021 21:15:21
Posted by Paul Lousick on 15/01/2021 06:20:29:

Clipped

316 stainless steel is a molybdenum-alloyed steel. The fact that it is also negligibly responsive to magnetic fields means that it can be used in applications where a non-magnetic metal is required. It also contains a number of other elements in varying concentrations. 316 can work harden and make machining difficult. It has a much better corosion resistance and is used for marine fittings.

I recently inspected the spindles on some model globe valves which I made about 18 months ago out of 304 S/S because they were not sealing properly and found that the seats were pitted and coroded. Now have to make them again, this time out of 316 grade.

Paul

50-2 globe valve.jpg

This are of corrosion is complex. A good guide is the PRE no which is a guide to pitting and crevice corrosion resistance

As a guide

304stst is about 18

316stst is about 24 so 30% better but if at elevated temperatures would not be considered marine.

Generally if there was a problem on a swimming pool or sea water I would look for a PRE >40

This takes us to super Duplex such as SAF2507 or 254SMO which is like 316 but with more chrome and molly.

Steve

Thread: Taper-Lock Bushes - tolerances
30/12/2020 15:25:11

h9 is clearly the intended shaft tolerance, I suspect the numerical tolerance is the range over which the taper locks should work

holding the h9 Will probably make removal easier if needed

steve

30/12/2020 11:14:39

The h9 tolerance I quoted is out the Fenner download. either way h9 or h8 top limit is 48.000

Steve

30/12/2020 09:45:08

If you don't want to wedge open the the taper-lock the shaft should be h9 giving 47.94 to 48.00 so your shaft is a smidgen oversize.

Turn it down or open out with screwdriver.

Steve

Thread: Hemingway Kits filing Machine
16/12/2020 12:54:30

Nice build log, keep it coming please.

Steve

Thread: Electric vehicles
20/11/2020 08:21:33

Its going to happen, see the news the other day that BMW are moving all combustion engine manufacturer out of Germany and retooling for doing the electric power packs in Germany. The report suggested so the German workers were protected for the long term.

Steve

Thread: Multifix toolholder Vendors
10/11/2020 18:41:52

I started with the create which was fine, then bought some more holders from Germany via Ebay and they fit pefectly, Paints a different colour but they were quicker and no carrier customs fee.

Using a genuine Dickinson that came with the lathe I occasionally got a Jam when parting, with the multifix straight through under power feed including 304/316 stainless steel.

Steve

Thread: Hand drilling stainless steel 3mm thick
10/11/2020 18:35:24

Its Hard work but not this hard.

Need an old fashioned corded drill with two speed gear box. trigger control helps more.

use good drills Dormer A002 work well, they are like a split point multi facet, use cutting fluid like Rocol or CT90.

I was doing M10 Tapping size in 316L 10mm thick. 4 holes per plate 8 Plates, took an afternoon to drill and tap, used two sizes of drill 5 mm and tapping size. Hard work but keep the pressure on and change the bit as soon as it starts to rub.

Steve

Thread: Parcelforce or DPD
28/10/2020 18:43:48

DPD every time as they will leave in a safe place. easier than going to he sorting office to collect parcelforce.

Steve

Thread: Hydrogen-powered train makes UK maiden journey
01/10/2020 08:27:56
Posted by john fletcher 1 on 30/09/2020 10:29:17:

I'm amazed at people who think electric cars is the answer to our pollution problems. Where do they think the electricity comes from and how is it produced. Also, the capacity of under ground cables are just not big enough to power all the car battery chargers which will be required. When our house, which was typical at the time it was built, it had a light in each room and one socket in the hall. Now most home up the road have a washing machine, dryers, fridge, freezer, immersion heater the list goes all on a 1920 cable and there is just one joint per pair of semi's. Just imagine how much energy is required to make a wind turbine and how long will they last, also consider the amount of energy to make PV panels and how long will they last. Then we have the biomass power station, importing the pellets from the US, apparently it just as polluting as the coal power station ever was, and what about the ship bring the stuff from US. As for hydrogen what a dangerous substance to have a train. John

Peak generation and distribution Capacity is near 50GW, averahe use is 32GW and mininum draw <20GW so as long as cars are charged off peah there is a lot of capacity,.

The use of smart meters will allow for more management of who charges when, and faster charging stations are appearing at petrol stations now,

I filled in online survey with one of the fuel majors where I pay at the pump and they clearly see themselves as an Energy company, watch to see how much some of them shift to renewables.

Steve

Thread: Stainless steel
27/08/2020 18:24:43
Posted by Stuart Bridger on 27/08/2020 17:39:03:

After getting completely fed-up with endlessly buying HP ink cartridges at no small cost, I moved to an Epson Ecotank based printer. Still using the original bottles of ink a year later with plenty still available

+1 Done the same been using it 2 or 3 years of fairly heavy B&W use and only on second bottle of ink.

Steve

Thread: Is This a Tooth?
24/07/2020 08:52:37

Posted by Oily Rag on 23/07/2020 21:46:05:

snip

Seriously, I like Lee's post that it might be a claw - bit too big for even a dinosaur's tooth at 5 inch long I would have thought.

Edited By Oily Rag on 23/07/2020 21:48:14

Longest Dinosaurs tooth 300mm / 12"

Steve

Thread: Warco WM280V-F Gearbox
06/07/2020 20:58:08
Posted by JasonB on 15/03/2020 15:52:13:

Is there a Circlip missing from the groove?

circlip.jpg

One of the interesting things with Barrys stripdown of the gearbox was the the O ring grooves, as the dimensions were decidly odd Barry sent me the dimensions and asked for my view on the circlips to use.

The dimensions were:-

Shaft :19mm Groove 18.5mm Width 1.3mm old circlip 1.0mm thick
Shaft: 18mm Groove: 17.0mm Width 1.3mm old circlip 1.0mm thick
Shaft: 15.74mm Groove: 15.36mm Width 1.22mm old circlip 0.94mm thick

The only one that is std that I could see is the 18/17 and that was after checking the imperial ones as well.

In the end I sugested the following sizes and comments.

Well all I can say is what a dogs dinner

D1400-019
D1400-018
D1400-016

I would get 10 packs as they are only a bit more than 2

If they don't look as if they will stay In place make a tapered mandrel out of steel
and lap the ID of circling with valve grinding paste.

Hopfully now that everything is sliding properly the circlips will stay in place.

Steve

05/07/2020 18:33:40

And the last part of Barry's journey back to a working lathe.

After final confirmation that the gear selectors were engaged and working properlye gasket sealing compound was applied and the rear cover panel refitted. Where the missing screw had been (original hole filled with sealer) I managed to extend the tapped portion of what was left in the casting and fitted longer screws which gave some purchase.

Gearbox and shaft taper shear pins refitted. Note table used for changing gear wheels. Corner removed to allow door to open, override block top right engages with safety cut out switch for testing, and banjo rests on the extended piece when pivoted forward. Final photo shows everything panelled up and ready for testing.

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Posted by Steve for Barry

04/07/2020 17:29:32

Next Installment

Refitting the front panel. I had removed the three knobs to give them a good clean. Each knob has TWO balls, a spring and a tensioning grub screw so care must be taken not to lose any part. These were removed before driving out the roll pins securing the knobs to their shafts.

I used some M4 nuts and bolts in place of the roll pins to position the gear selectors such that the selector arms would line up with the gear trains. The selectors were very loose, so to keep them vertical I inserted some 15mm lengths of bamboo skewer and slightly compressed them against the front panel with bolts screwed by hand into the tensioning grub screw holes. This method worked well.

The technique I found worked was once the arms were vertical it eventually becomes possible to get the actuating cams to engage whilst pivoting the front panel against the bottom of the gearbox housing. Full engagement could be confirmed by looking in a mirror positioned behind the gearbox (as in the last photo) then moving the selector knobs in both directions. Once comfortable with the positioning it was a matter of applying gasket compound to the previously cleaned surface of the gearbox, repositioning it in front of the mirror and repeating the pivoting motion and confirming again that the selectors worked correctly before refitting and tightening the 5 front panel retaining bolts.

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#24.jpg

#25.jpg

Loaded by Steve for Barry

Thread: What is this cutter used for?
04/07/2020 17:19:04

Revers sice chamfering tool on CNC. for deburring the far side?

steve

Thread: Warco WM280V-F Gearbox
04/07/2020 10:01:46
Posted by Howard Lewis on 03/07/2020 19:08:25:

So soon, you will be up and running again, and better than when the machine left then factory.

Good work!

Howard

Considering Barry did a conversion to three phase motor and vfd that was covered in MEW. Before this happened it will be a far better lathe than when new and shipped.

Steve

03/07/2020 18:29:29

Next Installment

Although I had read it elsewhere, I was surprised at just how ineffective the gearbox drain plug was. It is around 20mm ABOVE the level of the inner casting. This results in a large amount of residual oil cascading out when the front panel is removed. Someone had suggested adding a drain hole at a more appropriate position, so that formed part of my project. I decided to fit a magnetic drain plug and sourced one from eBay. It required an M12 x 1.5mm tapped hole. After some deliberation I drilled a pilot hole 19mm up from the bottom of the front cover in the mill. The panel was turned over and a 14mm mill, centred on the previously located pilot hole, used to produce a clearance for the M12 tap. The panel was again turned face up and a 10.5mm tapping hole drilled. The hole was then tapped perfectly square whilst still in the mill. The finish on the front panel although adequate for a panel face was not deemed good enough to guarantee a good tight fit when the magnetic drain plug crush washer was compressed, so a light skim with a 20mm end mill improved that area. I used a 20mm ‘Q’ cutter to produce the hole in the front aluminium cover plate, the centre of which had also been located using the pilot hole..

The last photo shows the reworked gear to the left on its keyway and the now smooth triple gear assembly on its shaft & keyway

#16.jpg

#17.jpg

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#21.jpg

#22.jpg

Posted by Steve for Barry

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