Recent Posts

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Mod-Ups! / Re: Case Hardening Experiments Mod-Up
« Last post by fatal-exception on Today at 05:16:27 PM »
Hey guys, I know this is about home brew case hardening experiments, but on the last McMaster Carr order I put in, I got a 1lb jar of Cherry Red. I have to say, it works like a charm (doesn't smell so good..:D) . I've done a bunch of mild steel parts and also some parts from 12L14. Nice thing is, there's no catastrophic cracking from quenching.  :beer:
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Project Logs / Re: New Tractor Shed
« Last post by awemawson on Today at 04:26:54 PM »
Oh yes Pete, it's getting a bit like the Grand Canyon  :bugeye:

... but we need more earth to level off the rest of it and form a consistent batter to the slope. When that's done and it's been adequately compacted I urgently need to get some foliage growing on it to keep it in place.

There will be a standard stock fence enclosing the little L shaped paddock behind the shed, with gates (4 foot to right of front and 10 foot on the diagonal corner ) and it will be a handy place to corral stock for short periods such as shearing and lambing.

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Project Logs / Re: New Tractor Shed
« Last post by Pete. on Today at 04:17:12 PM »
That drop down to the stream is looking steep enough to warrant a fence now Andrew :thumbup:
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Project Logs / Re: New Tractor Shed
« Last post by awemawson on Today at 04:10:53 PM »
Having clad the rear wall we were able to get the downspouts fitted, and as rain is forecast overnight we have fitted temporary 90 degree bends and pipe leading away from the building. Eventually there will be roddable traps where the 90 degree bends currently are.

Then we need to add a fair amount of height to bring ground level behind the shed up to meet the concrete floor. To this end I've ordered yet more lorry loads of earth - another four eight wheeler loads  :bugeye:
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Project Logs / Re: New Tractor Shed
« Last post by awemawson on Today at 04:06:08 PM »
So as promised a few pictures of the rear wall cladding going on. Rather repetitive I'm afraid but at least it's now done  :thumbup:
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Electronics & IC Programing / Lithium phone battery sizes
« Last post by picclock on Today at 03:22:05 PM »
Hi All

I am trying to make a chart of the capacity and size of lithium phone batteries for my projects. Phone batteries are the lowest cost lithium cells and can be very useful for home brew projects. Chargers are available for very little money <1, and they can supply a wide range of voltages with low cost step up convertors.

I can do 4 atm

HTC Hero  1.5Ah stated Actual not measured dims 50x80x10mm
Note III 3.2Ah stated Not measured dims 60x81x4mm
HTC Desire Z 2.45Ah measured 1.3AH @1A dims 64x44x4mm
HTC BM59100 HTC WINDOWS PHONE 1.7AH stated not measured dims 80x41x3mm  Weird connector so not very good.

Any other info will only make the list more comprehensive

Best Regards

picclock
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You can buy a thing called a "big head" fasteners, it's basically a bit of perforated stainless with a nut welded to it, bond this to the existing grip with epoxy, then laminate over it creating a captive nut.

Alternatively, bond on a piece of tufnol, whale or 10G40 would be my grade of choice here, the drill and tap it once the adhesive has set. Tufnol will give a better bond to epoxy than s/so, and is non conducting, so no galvanic corrosion
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Introductions / Re: Greetings All
« Last post by British Reaction Research on Today at 02:03:16 PM »
Hi PK,

Thanks very much for your interest and your comments.

I don't fully understand though. Why would I not get enough flow? And are you saying you built a Nox cooled motor?

Sorry for being slow on the uptake,

Carl.
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CNC / Re: DDCSV1.1 4 Axis controller
« Last post by Avis on Today at 12:51:48 PM »
On several occasions the program of the DDCSV1 panel has stopped and I have had to disconnect it to restart this one again, I do not know how to solve this problem, maybe with a ferrite filter at the input of the feed do something. Has anyone had this problem?
Thank you
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CNC / Tom Senior mill CNC converison
« Last post by Charles on Today at 12:49:29 PM »
Looking at the big pile of half completed projects, and the lovely August rain I decided to finish the CNC conversion of my milling machine - I've been making / purchasing parts for this for over a year now, and looking at the accumulated pile of stuff I realise that the only thing missing now is the stepper motors, easily solved with a quick trip to eBay  :D

I stripped the mill down some time ago and took a load of pictures / measurements, then modelled the 3 axis's drive systems in Solidworks, so I've been able to make the bits for the conversion using the mill. But now I've started taking it apart, any further parts or alterations can only be done on the lathe, or using the pillar drill at work.

Starting at the bottom the existing Z axis nut mounts into a substantial cast iron holder which will happily accept a ballnut, only one problem: the ACME nut is 1 1/2" diameter, and the ballnut is 36mm. So, into the lathe, skim the bore, press in a plug of aluminium and bore to 36mm. Once the nut is a nice slide in fit, take it to the pillar drill and drill & tap through it for some fixing bolts.

The Y axis is an odd mount - see the drawing below - unfortunately when I offered this up it fouled the bottom of the cavity in the knee casting :doh: after much head scratching the solution was to cut the bottom of the flange off of the nut, cut the bottom of the carrier away, and reduce the height of the carrier by 4mm. This necessitated making some temporary cheeks to fit the carrier so that I could grip it in the 4 jaw. Next problem will be modding the bearing mount to raise the axis of the screw by 4mm

The x axis went in smoothly, the nut wont fit through the hole in the casting, so is reliant on the fixing bolts for alignment, but as the screw is supported both ends I'm hoping this will be OK...

Next challenge is removing the crank & bevel gear that drove the Z axis - it appears to be retained by a taper pin, through the collar just behind the gear, but its not responding to the application of my hammer. Any ideas? before i get the grinder out....
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