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| mattinker:
Hi, I got two more moulds rammed up, The Banjo casting and two riser blocks. This is not the actual mould that I cast, I forgot to take the pics, but it's nearly the same I made the banjo with out the raised ribs in the original, I think that I'm not steady enough to pull of a casting with that kind of detail! Well, the casting is done, I don't know when I'll be able to get to start machining, it will be as soon as I can! Regards, Matthew |
| doubleboost:
--- Quote from: mattinker on August 15, 2013, 05:15:26 PM ---John, what's the centre height over the cross slide on your Boxford? The Emco Compact 8 is 60mm I'm curious to know how different the projects are! VT, I picked up the casting with quite a lot of glitches, the thing that I hadn't quite remembered was how much of a buzz casting is, such a satisfying thing to do!! Regards, Matthew Hi Matthew the distance between the cross slide and the lathe centre is 70 mm John --- End quote --- |
| mattinker:
Hi, it's been a while! Things keep getting in the way. I've been working on the casting, starting with a skim over the top. With two 4mm rounds to compensate for the draught. The boss for the cotter was a little proud, which meant that once milled, I had a small flat to seat it on. The base trued up really well and I got a finish that I was really pleased with after taking off 1.5mm. Leaving the centre height The "T" slots on the Emco are only 6mm wide, which is going to have to be OK! Drilling 5mm holes for the guide pins. I drilled four locating hole holes, so that I will be able to line up the dividing head at 90°s as well as in line with the spindle. Locating pins, slotted with my hacksaw. Tapping M6 Pins in line with the spindle. 90°s Lining up to drill the split cotter hole. First step drill, 6mm. Drilling out to 15mm. Finishing with a 16mm slot drill, I haven't got a reamer that size. Split cotters are pretty forgiving! Before I could go any further, I needed to make "T" bolts. I used a piece of hot rolled 10mm square bar, it was slightly oversize, cleaning it up with a file brought it down to size. A light came on, I'd never thought about using my self centring punch on square stock before! Popped! Centring in the four jaw. Centre drilling. |
| mattinker:
Oups! I hit the post instead of the preview button! Facing off. Drill to 6mm cutting off four pieces with the the bandsaw. I turned the heads off for 6mm bolts. The bolts were then brazed into the square heads. Faced up and cleaned up with a file. I had originally intended using brass for the split cotter, but I kept on having a doubt about brass in Al, I actually made one in brass, but I decided against it after a bit of reading on the web. I am going to bore with the cotter in place. So, apiece of 16mm clod rolled, 55mmlong was chucked up in the three jaw. Trued up and centre drilled. Drilled all the way through 5mm, taping size for 6mm. Starting the tap by hand. Tapping 25mm deep. I then turned the part around in the chuck and drilled 6mm, clearance 6mm bolt to a depth of 30mm. I'll explain all this once the casting is bored. So this is what it looks like so far on the Emco. More later, regards, Matthew |
| PekkaNF:
Would you elaborate a bit of this split cotter design consideration? I'm familiar. with the design and have this same book and read some further info, but haven't used this method yet. Therefore I'm interested to hear reasoning about the material choices you made. Pekka |
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