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spuddevans:
Today's update:

I started on shaping the crossheads. I used a plunge-cutting-rounding-over mini-router bit from my dremel-clone to shape it.

Then after centering it I cut it down both sides and the middle.

Then the other one, and then I marked them both up for milling.

Mounted in the vice on some parallels and cut down both sides of the fork.

Then I milled out the centre of the fork, opened out one hole from 3mm to 4mm, and then rounded off some edges and then spent a fair bit of time in smoothing out with 360, 600, and then 1000 grit wet-n-dry, and then re-reamed the deep 4mm holes for the crosshead rods and tapped the M3 hole.

And here it is next to the unmilled crosshead block.

As you can see on the unmilled crosshead, I've drilled 2 6mm holes in order to get a nice curve profile between the upright guide portion and the fork part.

I had been toying with the idea of milling a couple of, say 2mm slots to expose part of the crosshead-rods, but I didnt have a 2mm or smaller cutter and I wasnt sure if it would negatively effect the crossheads themselves.

That's all that I was able to get done today, the shaping took a little longer than I thought, but I didnt want to rush at it as it would be a real bummer to mess up on one of these crossheads. I'll work on the 2nd crosshead over the weekend.

Tim

sbwhart:
Lovely job Tim

Good use of that dremel router :nrocks:

:clap: :clap: :clap: :clap: :clap:

Have fun

Stew

CrewCab:
Nice going Tim, really enjoying your exploits :thumbup:

How did you go on using the router cutter, I know John (BS) is a fan, and to be fair on brass and ally I can't see a problem; must get round to giving it a try .......... Oh well at least I can get in the workshop now, things are looking up :headbang:

Looking forward to your further adventures :beer: you put it over well and it makes enjoyable reading, thanks :med:

CC

spuddevans:

--- Quote from: CrewCab on August 07, 2009, 02:03:14 PM ---How did you go on using the router cutter, I know John (BS) is a fan, and to be fair on brass and ally I can't see a problem; must get round to giving it a try ..........

--- End quote ---

I found them just great to use. they are quite small, 3.2mm shanks and from 3-9mm in diameter. I ran the plunge-rounding-over bit at about 2000rpm ( I say "about" because I dont have a tach' on my mill )

I took cuts of about 0.5-1mm per pass. It cut very easily. Actually this is the first time I've ever used this mini-router bit set, I've had it for about 8 years !! I think it cost about a fiver for 10 HSS cutters. I reccomend everyone to pick a set up, they cut great on the softer metals :thumbup:

--- Quote from: CrewCab on August 07, 2009, 02:03:14 PM ---Looking forward to your further adventures :beer: you put it over well and it makes enjoyable reading, thanks :med:

--- End quote ---

Thanks CC, I'm enjoying these adventures too :dremel:

Tim

CrewCab:

--- Quote from: spuddevans on August 07, 2009, 02:27:56 PM ---I say "about" because I dont have a tach' on my mill
--- End quote ---

Neither do I, so I bought one of these

for the money they are pretty good, you need to practice a bit and learn when the readings are "a bit off" ........... but I find it a useful tool for little cost :thumbup:

CC

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