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Member postings for John MC

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

Thread: Scrollsaw for the occasional user
11/03/2019 11:04:38

I bought a Ferm scroll saw from Screwfix 15 years ago, cost about £40 , for occasional use. I've been delighted with it. For me occasional use has been a few time a year, cutting various woods for casting patterns, name plates mainly. Tilting table, essential for pattern making, single speed. The only failure was the squash ball thing that was supposed to blow the sawdust out of the way, the rubber failed, old age? A small brush works just as well. Ferm seemed to be Screwfix's low cost brand at that time, based on my experience with Screwfix in general I think I would try one from there current low cost range again.

John

Thread: Huge dial gauge
01/03/2019 13:43:14
Posted by Robert Atkinson 2 on 01/03/2019 13:01:27:

Most likely for a measurement indication point that was relatively distant from the adjustment / setting location position. Now we would just use a electronic sensor with a remote display.

Exactly that, I spent some time working in an engineering laboratory testing various structures. These structures would be festooned in these large DTI's, easy to read. Could get a bit tedious with 30 - 40 of them to read and record. We were delighted when electronics made them, for us, largely obsolete. I remember boxes of them going in to a skip when electronics became cheap and easy!

Thread: Rev counter (Tachometer)
27/02/2019 09:08:57

Many thanks for the replies. I have tried the magnet in both orientations, both work but positioning is far more critical with the magnet on the periphery of a disc rather than the side.

The device is quite slow to respond to speed changes, I guess thats reflected in the price! Also seems accurate compared with a hand held "Smiths" type tacho.

One final question, does the "strength" of the magnet effect the performance of the device?

John

24/02/2019 17:38:56

I have recently been given a couple of electronic tacho's, cheap things that you will see for sale on Ebay. I want to use them on my milling machines.

The question I have concerns the mounting of the magnet. Initially I wanted to mount it on the side of an aluminium disc, this being fixed to the driven pulley. Problem is that it would put the (Hall) sensor in a position that could vunerable to damage.

I now want to mount the magnet on the periphery of the aluminium disc, this will move the sensor to a better position.

My question is does it matte how the magnet is presented to the sensor?

Thanks,

John

Thread: Warco Super - Major Vario inaccuracy
22/02/2019 16:50:35
Posted by Neil Wyatt on 22/02/2019 11:4

A quick google will show Tormachs and Bridgeports being shimmed to correct similar errors so neither the issue nor the cure is unique to far-eastern imports.

Really? Not familiar with Tormach machine tools but Bridgeports I am, I'm assuming the turret type, M and J type heads. These will not be shimmed to correct errors that have been described in this thread and the other now closed thread. The heads tilt and nod so the errors can be eliminated.

I wonder if, in this case, that shimming the gib strips has caused confusion. A well known trick to extend the life of a Bridgeport before commiting to the expense of re-chromed and ground slide ways.

John

Thread: Mystery object
16/02/2019 08:22:53

It's a fiducial indicator. Fitted to (engineering) inspection equipment to ensure consistency of measurement.

John

Thread: What Did You Do Today 2019
15/02/2019 08:01:32

A few years ago i was given most of a horizontal mill, I have the space for it so rather than see it go to the scrappy I gave it a home. The intention was to convert it in to a surface grinder, but after some thought a second mill would be far more useful, particularly a another vertical.

Eventually I acquired a suitable head to adapt to fit the machine, specifically one from a Chinese lathe/mill. This had a 3MT taper, I need 4MT so the tooling is interchangeable with the other mill, so made a new spindle with a 4MT.

But how to get the taper running absolutely true? I've done this in the past by finishing the taper on the mill by angling the head over at the right angle with a boring bar clamped vertical on the table , that is to say finishing the spindle off its own bearings.

Problem is that the head does not have the tilting facility. The attached photos show how I did the job. I borrowed a second fixed stead so I could "clamp" the quill to the lathe bed and used a cranked carrier to drive the spindle, (from a chuck jaw). I was pleasantly surprised at the rigidity of the setup.

John

img_20190214_152616579.jpgimg_20190214_152636494.jpg

Thread: Single to 3 phase invertor and smart meters
11/02/2019 17:54:43
Posted by Samsaranda on 10/02/2019 21:50:20:

John, in the UK there is no facility for monitoring how much generated power is fed back to the grid with domestic metering, the government assumes that 50% of kWh that are paid for with the feed in tariff will be exported to the grid so they pay every PV generator for the deemed 50%. That could change with smart meters if they can detect exported kw hours.

Dave W

Its the 50% "guess" thats the problem if I have a smart meter installed, it will know exactly whats happening. I am told that the 50% figure is fairly accurate, it may favour the home owner or not, eitherway its marginal. But why give away money? Without going back through my notes from when the panels were installed, I think I understand your point, hence the 50%.

John

10/02/2019 11:51:37

I've recently been asked by my electricity supplier to consider having a smart meter fitted, initially i was put off by the guy at the other end of the phone being quite insistent that it would save me money! As we all know, it won't, its the consumer that can do that, with or without a smart meter.

For me it was an easy decision not to, the array of PV panels on the roof decided that. I could, possibly, affect the amount of money I get from "feed in", difficult to tie down exactly but it could cost me so no smart meter.

John

Thread: One off castings
08/02/2019 16:45:53

DM foundries at Stroud, not that far from Reading.

John

Thread: WHERE ARE THE SHAPER USERS ?
06/02/2019 10:44:42

RG2's group of three photo's, middle photo, is that a £10 note twixt clamp and work?

Thread: What Did You Do Today 2019
04/02/2019 17:43:36

Used the slotter for the first time this year. Put a keyway in to a part for a milling machine.img_20190204_164317752.jpg

Thread: Rotary table + cross slide ....... why ?
03/02/2019 11:47:31

I have a Pollard Corona drill that has an X-Y table with an old Ortec DRO fitted, bolted permanently to the work table. Extremely useful, with a trued up vice and an edge finder I rarely mark out before drilling now. If the X -Y+rotary table had more travel I think I would buy one to extend the versitality of the set up I have described.

John

Thread: Skyhooks - an overhead solution
29/01/2019 07:41:53

Magnetic tools are a nuisance, I would avoid these things like I would the plague!

Thread: Get on yer bike
28/01/2019 10:49:50

Kudos to Ady 1. Just got back from a 20 mile road ride, 'flippin cold! I'm still happy to mix it with other road traffic but would consider a static trainer in the future. I've recently had a go on a friends set up, a "real" bike connected to a loading device that replaces the back wheel and some computer wizardry called "Zwift". I found this really quite engaging. My real cycling passion is mountain biking, well away from the risk of other traffic.

John

Thread: The Diamond Tool Holder
21/01/2019 13:30:55

I bought one of these in 1980 something. Work took to me to Australia so I arranged to buy 8 plus grinding fixtures, not all for me! I think that there were only two sizes then, I had one of each.

Initially I was impressed, they worked well enough on my relatively light weight lathe. I upgraded to more rigid machinery, and found that the the tool would move downwards under a heavy cut/feed. Could also be the source of vibration. Easily sorted with the large butt-welded HSS tooling I had. Not as easy to sharpen though! For a while longer I used the diamond tool holder as a finishing tool until I got to grips with disposable tips. The tool holders went when I upgraded the smaller of my two lathes, something I have occasionally regretted.

A couple of criticism I have of them is how often is an internal square corner needed? Best avoided if at all possible. A good friend who worked in a toolroom ground radii along the edge of several pieces of HSS for me. Was this something offered by the supplier at on time?

Also, tougher steels would soon bring on the need for frequent sharpening that (near) square corner could be a bit delicate.

John


Thread: Free Electricity
17/01/2019 08:28:16
Posted by not done it yet on 16/01/2019 20:23:45:

Not so free if and when you wish to sell your house. The legalities, etc likely cost the vendor thousands. These rented roofs are a minefield for potential house purchasers. Far better to install your own kit and avoid the third party renters of equipment. They will go mostly go out of fashion when the FIT scheme finishes in a couple of months time. Doubtless they will come up with some other money spinning scheme...

Absolutely, a real minefield when it comes to house sales and maintenance of the building. Also a number of hidden cost with these rented roof installations, homeowners paying for the cost of scaffolding for the initial installation, costs for an "annual inspection", cleaning costs. There were others I found when researching this. Each installer, it seemed to me, had there own crafty ways of maximising there earnings!

I bought my own installation, for me by far the best option. I worked out that I would get my money back in about 8.5 years, just checked this and am on course for that, if no component failures happen.

I also had an immersion heater controller fitted with the panels at a very good price, in the summer that gives me all the hot water we need at a very, very low cost.

Thread: Drill Doctor 750SP
04/01/2019 18:52:47

Anyone had any success with one of these? I've had one for 20+ years. My first attempts produced drills with a negative clearance behind the cutting edge. No matter what I did (or friends who tried) it would not grind the correct clearance. I contacted the suppliers who replaced it with another. Unfortunately just the same results.

I really should have asked for a refund at that time, instead it was placed on a shelf in the workshop and forgotten about. That is until a recent thread on this forum reminded about it. So had another go, same results.

So, what am I doing wrong, any ideas?

I've now looked at several forums on this subject, some say they work well, others have had the same experience as me. The fact they can work makes me think its me rather than the machine, surely not a manufacturing fault?

In the intervening years I used a Draper attachment on a bench grinder, cheap and nasty but worked well! The I bought a drill grinder similar to Warco's, a super piece of kit!

Thread: Lathe identification
03/01/2019 16:35:08

Many thanks for the replies. I think it safe to assume its an Atlas or UK clone. I asked on behalf of a friend who will soon advertise it for sale. Now the advertisement can be somewhat more informative than just a "lathe for sale", thanks again guys.

John

03/01/2019 09:08:17

Can anyone identify this lathe? Thanks, John

Edited to say the metal turning one,not the one in the foreground!

richards lathe.jpg

Edited By John MC on 03/01/2019 09:09:30

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