Supporting > Tooling & Machines
Yet another Quorn
Bruno Mueller:
I also used these hydraulic lift rods for my Bonelle. My rods were surface hardened and hard chrome-plated.
Charles Lamont:
Six months after the last post I managed to get back to the Quorn.
During that interlude I have made the little instrument vice I posted a while ago, dug out and cleaned up the cam grinder and made some cams for demonstrating the thing at MMEX last October, and have completed the Power Hacksaw Refurbishment, also being reported here.
Now I can get back to the Quorn as No 1 job. I am trying to make an impression on the castings, having an extended session on the iron. I am doing a bit of work on each part, establishing initial datum surfaces and then putting it aside for coggitation before the next step.
Now, I decided long ago to use pad clamps rather than split the castings. For the best results, and following GHT's methods, the main hole is bored with the clamp pad in place. This means that the hole for the pad has to be made first. I am allowing just 1/64" clearance between the main hole and the clamp bolt, to give the clamp pads as much contact patch area as possible. I am finding it hard to organise proper datums on the castings so that I can be sure of getting the pad and main holes at the correct centre distance. There will be more on this shortly.
The next castiing to attack was the Workhead Base, two photos showing boring for reaming the 1/2" hole for the split pad clamp, and two of boring the main 1" bed bar hole. The angle plate and 123 blocks provide squared up surfaces to clamp against. These two set ups were infuriating because the casting is lopsided just where it sits on the packers, and every time I put clamping pressure on top, the blasted thing tipped over.
At the right hand end (left in the photos as it is mounted back-to front) I increased the bore very slightly as it can be compressed by clamping the Rocking Lever on to the rather thin walled seating spigot that is turned at this end. The main part of the bore finds the roundness faults in the front bar and is too tight in places. In boring I could hear some variation in the texure of the metal at different parts of the circumference. It will need a little lapping.
The final photo shows the Wheelhead Bracket being roughed parallel and square to unmachined surfaces. This has now been machined both sides to final width. I will probably follow the bible and make the spindle housing to finished OD to use as a gauge for boring the big hole.
Krypto:
While I have no plans of making a Quorn grinder, I really enjoy seeing the interesting setups used to machine the parts.
Chipswitheverything:
The Quorn casting machining is coming on very nicely, the shapes of the castings are certainly a test of patience and some ingenuity in holding them for the various operations. I should think that every clamp, tee-nut and packer that I could find in the workshop was hauled into use at some stage when I was tackling them. Your set up photos bring back to mind some of the rather laborious contrivances that I was "enjoying" playing about with ... Dave
Del_61:
I have built my Quorn using the mk 2 castings but to the drawings of Hemingway which has several modifications and is now called the mk 3.
I also built mine using the split cotter method and slightly longer bed bars of p.g.m.s. I have to say that "Time Saver" lapping compound was used on getting the final lapped finish on some key components.
There are lots of improvements and modifications to the Quorn design over the years, there is also a dedicated forum to the Quorn as well.
The most difficult part (so far!) Is the spindle. I decided that treppanning was way to stressful and built up these components carefully individually and loctited them together then finished them off on a specially made mandrel.
I still have to make up some bits yet, is a Quorn really ever finished?, but it was a challenge and has taken up about 5 years on and off.
I found a parvalux 3 phase motor from Ebay that I drive using a small inverter, but I am having significant issues joining the round plastic belt !!! All those difficult to hold, tricky castings and I cannot get my round belt to stay joined without the join failing. I might just buy a ready made one !
Good luck with the build, I made all the ball handles as it looks so much better, but I haven't decided if I am going to make the spiralling attachment though.
Regards
Derek
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