Todays update from Bodgers Lodge

[John Stevenson 1Participant @johnstevenson1]

Ran it at about 1800 to start and it seemed OK at that speed so left it.

Took quite a few passes as I had to remove about 50 thou to get all the grooves out.

[mark costello 1Participant @markcostello1]

Keep posting Sir John, enjoy all this tremendously.

[Ian S CParticipant @iansc]

John, did you grind out the whole .050", seems a lot.

Ian S C

[John Stevenson 1Participant @johnstevenson1]

Sorry mixed units.
0.5 mm so only 20 thou

[ChrisHParticipant @chrish]

This is a thread I never miss!

What a brilliant idea, I have no surface grinder as yet but just maybe I will have, my mill goes up to 2100rpm-ish, well worth a go.

[Ian S CParticipant @iansc]

The reason I asked about the amount to be ground was that I used the mill to grind a bit of steel, and found that I took for ever to get to the size required, took off about .005". This was after reading on another forum of one guys adventures, he reground the table of his mill in situ.

Ian S C

[Howard LewisParticipant @howardlewis46836]

As always, John's posts show rather unusual jobs, and innovative ways of overcoming problems, that often end up better than the original.

(Problems that many would dismiss as " No chance! Buy a new one&quot

Keep up the good work John!

Howard

[john carruthersParticipant @johncarruthers46255]

I too look forward to John's posts, I invariably learn something.

[John Stevenson 1Participant @johnstevenson1]

Thank you, it is appreciated.
Just got back from local scrapyard and they have got a Colchester Master in in quite good Nick with a load of tooling etc. This is an early model on the cast legs so possibly pre WEll ?
Now they are keeping this and not scrapping it for their own use, pins, washers etc.

I popped down to have a look at why the saddle was lifting at the front which is just a bit wants taking off the bottom keep. However whilst the apron is slid back the gear driving the cross slide is badly damaged and needs a new one making. Original is CI but I reckon I can shrink a bronze sleeve onto it and belt a few teeth onto that. They are stripping it down today. Perfect post for this thread.

Watch this space.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by John Stevenson on 09/08/2016 10:47:33:

… Perfect post for this thread.

Watch this space.

.

Looking forward to it, John

MichaelG.

[HopperParticipant @hopper]

Posted by John Stevenson on 04/04/2016 23:22:14:

Too soft Michael.

Something like this dynamo is going to spend the rest of it's life being pulled to pieces, it's just the nature of the beast given it's age and owners like to mess with them.

If it is anything like old motorbikes, this is the cause of many, many problems that arise. Some of the stuff I see, a good argument could be made that handtools should be licensed, not guns.

[John Stevenson 1Participant @johnstevenson1]

Well they came to collect the keep plate this afternoon and dropped the old gear off.

Looks even sorrier now it's out than it was fitted.

17 teeth out of 63 are either broken or damaged. Some have been half repaired in the past.

Not clear from this shot but it's a helical gear, only slight 2 degrees but is is helical. No idea why anyone would want to put this slight an angle on ?

Wondered at first if someone had cocked up and not put the hob lead angle on but the mating gears are the opposite hand so it's definitely been designed this way.

Won't get a chance to get round to it until late this week or early next week as believe it or not got a shed load of rotors to convert from metric frame to imperial frame.

[HOWARDTParticipant @howardt]

Perhaps someone bored the gear centres wrong.

[Peter KroghParticipant @peterkrogh76576]

Now this is the sort of thing I watch this space for. Every day!

Pete

[John Stevenson 1Participant @johnstevenson1]

Forgot to mention, ulterior motive at work here because the guy who owns this lathe also owns these two tubs.

These are about 3' cube and it's all carbide cutters and tips.

So hopefully payment it kind will work out far, far better.

[Ian S CParticipant @iansc]

Perhaps the gears were cut that way so that to buy a replacement, it had to be an original, not just one the same size off the shelf.

Those tubs look heavy.

Ian S C

[John Stevenson 1Participant @johnstevenson1]

They are heavy, there is about 2 tonnes in each and at current scrap prices that about 32 grands worth for both tubs !!
Little wonder they are normally buried under loads of other stuff

[MWParticipant @mw27036]

Its a nice find but cmon, 32 gs? Thats crazy talk. how are you going to get that verified? anyone spending 32k is going to want info.

The angle on the gear is probably to ease the transition of movement, giving a slight twisting to the motion. 

Michael W

Edited By Michael Walters on 10/08/2016 13:31:43

[John Stevenson 1Participant @johnstevenson1]

Verified ?
Don’t understand ?
Scrap carbide is ?8 a kilo, work it out

[MWParticipant @mw27036]

If you say so, mi lord. I wouldn't want to be the guy to take it off your hands though.. so yeah good luck with that.

Michael W

[JasonBModerator @jasonb]

I don't know, a quiet afternoon with the delectable Debs and an EMG-12 for company and there will be plenty wanting to take the resharpened cutters off JS's hands and at a good mark up from £8/kg

[Neil WyattModerator @neilwyatt]

> 17 teeth out of 63 are either broken or damaged. Some have been half repaired in the past.

Sounds like my mouth…

Currently £8.32 a kg.

tungstencarbidescrap.co.uk/tungsten-carbide-scrap-price-uk/

The contents of the ginger beer can on the back of the EMG-12 must be worth about £10

Neil

[Raymond AndersonParticipant @raymondanderson34407]

Apologies if this belongs in a separate thread, so the mods can move it it that is the case.

Jason, re the resharpening of the end mills, does the EMG only sharpen the ends but not the flutes ? If the flutes are blunt how does that effect the newly sharpened ends ? If for instance you had a slot to mill say 10mm deep , if the flutes are blunt then would you not be limited to very small depths of cut or even if you wanted to make the slot wider you would be unable to use the sides . I could be well off the mark here, but I always thought that the ends AND the flutes should be sharp. Ok, if the flutes were to be sharpened the mill would be under size. but it would cut as the makers intended. This is just a general observation, and certainly if I wasn't hung up about the flutes I would have one in a flash.

[JasonBModerator @jasonb]

Raymond a lot depends on how the cutter has worn, if it has been used a lot for profiling work then most of the sides will also be worn so would need a complete sharpen. If on teh other hand it has been used for small depths of cut then there won't be so much wear along teh whole of teh flutes so just doing the ends which is what teh WMG-12 & 16 do does give the cutter a new lease of life, certainly did for all the ones I had relegated to teh blunt or side use only box.

Even if say half teh flute length was heavily worn you can get out you thin cutting disc and lop off the end then grind new ends to teh flutes so even very blunt or damaged cutters can be resurected. Probably takes 20secs more to sharpen from a cut off end than just to resharpen existing tips.

Have you seen the test I did in MEW?

[Neil WyattModerator @neilwyatt]

It sharpens on the end only.

Having seen dozens of EMG12-sharpenmed end mills, they almost all started off with blunt corners and just needed sharpening back to pointed corners to be perfectly usable.

One exception was a 10mm slot drill where I had snapped a whole corner off – JS had to grind it back by about 6mm before sharpening.

I suppose it depends on both how you use and how you wear your endmills; most wear for me is in the first couple of mm but ic an see how some users might mainly do profiling work that mostly wears the flutes.

Neil

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