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Member postings for Pete.

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

Thread: Qualters and Smith Qdm750 Restoration
18/11/2021 18:27:55

Hi Martin,

Getting there slowly, I did have to drive 100 miles to pick it up, but couldn't stop myself at less money than an import RT costs, the 10" version is a bit heavy for use on smaller machines and doesn't have the indexing setup, I bet the bits from hofmann to convert my other one would cost as much as I paid for the 8" one.

The rust removal solution is call Fedox made by Fertan, the cheapest I found it for was £21 for 1 litre, this is concentrate which is added to 10 litres of water, Evaporust just checking now is £52 for 10 litres which is in a ready to use state so works out quite a bit more expensive.

17/11/2021 01:53:44

An 8" hofmann rotary table came up on ebay at a decent price and in excellent condition so I thought as it has the indexing discs, that'd be good to permanently mount on a small X Y table on the base table, it's much lighter than the 10" version I own and only about 70mm high, really nice bit of kit.

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17/11/2021 01:48:09

Then gave them a cold blackening treatment, it doesn't always work to well on old parts with grime worked into the surface over decades, can be a bit and miss, some parts look a bit of a dark bronzy colour, but much better than the rusty look.

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17/11/2021 01:43:49

Spent an evening cleaning up all the nuts and bolts, before and after.

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17/11/2021 01:40:56

Had a bit of a problem with the etch primer, I painted 4 of the castings, 2 dried fine, 2 were still tacky 24 hours later, which anyone who has used Paragon etch primer knows it's normally touch dry within an hour, turned out when I did a degrease with some Acetone it soaked into the surface of the cast iron then got trapped when painted over with the etch primer, anyway, that had to be washed off with thinners which was very messy and annoying. got it all clean and left for 48 hours for any solvent to release and painted again, this time fine, so got all the bits etched up now.

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17/11/2021 01:32:56

I then soaked the base table and upper table in an evaporust type solution as the base table had some light corrosion in the root of the where it had been fly cut, I didn't want to remove metal to get it gone, it worked quite well, The picture of the solution is actually the table of the Bradley hand shaper which I'll do a thread on the restoration of after this, the second picture is the de rusted base, I say de-rusted, but the rust you see on the non machined part is flash rust that happens very quickly after washing the solution off, I cleaned the machined part down with solvent then sealed with Ren wax.

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Edited By Pete. on 17/11/2021 01:58:07

17/11/2021 01:22:59

Little update, after finishing cleaning all the castings down to bare metal I filled a couple of the casting imperfections.

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Thread: How can I cut 0.8mm thick stainless steel sheet more accurately by hand?
06/11/2021 01:42:41

The circled area that was laser cut appeared to look rougher than what I got using a shear, I'm just saying a bench could create 4 straight edges in maybe 30 seconds or so, effortlessly.

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Edited By Pete. on 06/11/2021 01:43:27

06/11/2021 01:33:09

I didn't forget about the requirement of needing to put it on a shelf when not in use, mine weighs about 12kg and it's no problem putting it on a shelf when not in use , you can buy this small bench shear from a Polish seller on eBay for around £70, it weighs 6kg, I don't think anyone would struggle to put that on a shelf.

The lower blade is also positioned horizontally, so it acts as a small table which is quite useful.

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04/11/2021 23:26:39
Posted by Howard Lewis on 04/11/2021 22:25:10:

Has no one suggested shears, preferably bench shears?

The long blade of bench shears will give a cleaner and straighter cut than a saw.

If no bench shears, grip one handle of hand shears in the vice, so that it behaves as a small bench shear..

Less easy if the sheet is longer than the blade of the snips.

Ideally, a guillotine for the job.

Howard

Edited By Howard Lewis on 04/11/2021 22:25:50

Howard, I have mentioned bench shears in a previous thread about sheet metal cutting, I even demonstrated it, the OP drew up a cad model showing potential microscopic edge deformation showing this method wouldn't be suitable.

Since then the OP had the parts laser cut, the laser cut parts he had made looked like they had a rougher edge than the bench shear.

The photo below is the demo I did to show the part would remain flat, but apparently microscopic edge deformation means this is no good.

Edit to add the OPs original method mentioned the edge would be fettled for final finish, so why this microscopic deformation was a problem I don't understand. 

Bench shear 2

Edited By Pete. on 04/11/2021 23:30:28

Thread: Wanted - small pulley project and/or engine mounts..
04/11/2021 00:22:39

If you want an idea on what's involved machining a belt pulley, this 3 part I think it was, series of videos will give you an idea, bear in mind the guy doing the machining is also very experienced, you only have to browse this forum to find out many people can't do 'simple' operations like parting off.

Edited By Pete. on 04/11/2021 00:23:21

Edited By Pete. on 04/11/2021 00:24:26

Thread: Qualters and Smith Qdm750 Restoration
04/11/2021 00:02:22

Scraped all the paint off the castings, put a bit of stripper on after and wire brushed the remaining paint off, a pointed end brush in the drill got in all the corners, very useful, got to fill a few small casting imperfections then all the parts can be etch primed.

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Edited By Pete. on 04/11/2021 00:03:05

03/11/2021 23:54:10

So removed the back gear bearing, also noticed that there was a small wear patch on the top of the head casting where the back gear sits, might put a thin oilite washer between those parts when I reassemble it.

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03/11/2021 23:46:08

Bought some new tools, always nice to have an excuse to buy more tools, I had a worn out smaller set of tube wire brushes, must be one of the most useful things when doing things like this, so bought a bigger set this time, also a set of cheap bearing press discs, well worth the £40 I paid, should have bought some years ago, and a slim foot bearing puller.

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03/11/2021 23:35:25

Hi Martin,

I did initially have the same thought that the flat machined on the casting held the nut captive, but it didn't, I then noticed when the handle is on the left side, it does work as you say, the flat is less deep on the left hand side for some reason.

Pictures below are the cast ally lids as we have, and the square newer type, I think this is like AJAX's? possibly sheet steel? excuse the poor quality image It was a screenshot and the original was poorly focused.

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Thread: Wanted - small pulley project and/or engine mounts..
03/11/2021 18:56:11

If it only takes 5 minutes I'm sure you can find the time to learn metal turning, that should take you all of 10 minutes.

Thread: Stripping down Elliott Progress No. 1 Mk. 1 bench drill press
02/11/2021 00:13:03

That's a nice colour, good to resurrect something that's been unloved, it was probably someone's pride and joy a long time ago.

Thread: Qualters and Smith Qdm750 Restoration
01/11/2021 23:56:00

Had look at the table ready to strip that down next, a bit more evidence of its school background, and luckily it escaped its time in education pretty well, only a few small drill holes in the very centre of the table, also noticed a few nice design details, the tracks either side of the slot in the table to hold square nuts captive, and machined flats on the underside of the table edges to place a clamp on if needed, I thought these were nice little touches.

Is the handle on the table clamp original? it doesn't have a captive nut which would get annoying pretty quickly, something will need to be done with that.

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01/11/2021 23:45:01

Had another little play in the workshop after dinner, I foolishly completely forgot about the potentiometer, luckily it had room without hitting anything behind, I fitted the tacho, drilled the two holes in bottom plate for the power in and out, and stripped it down ready to paint.

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01/11/2021 17:43:10

Had an hour this evening on the project, fitted the inverter into the enclosure, start stop, forward reverse, and emergency stop, bit of a tight squeeze making sure nothing obstructed the switches from behind, should just squeeze the Tacho in there too.

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