Author Topic: Quorn grinder build finally coming onto the home straight...  (Read 309 times)

Offline Chipswitheverything

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Quorn grinder build finally coming onto the home straight...
« on: January 24, 2023, 11:08:25 AM »
The castings for my Mark 2 Quorn grinder were bought from MES / Ivan Law, back in 1982, along with the motor, wheels and dresser.  Total cost was about 170, the Mark 3 one recently offered by Hemingway kits is about 700 for the equivalent, but I don't know if I had a bargain back then or not! 

Haven't got a lot of photos of the very protracted and occasional work on the build, a lot of it was pre digital camera.  Almost all of the components are now made, other than some items like the dedicated bolts and washers that are needed to assemble the ball ended levers to correct location, and there is the final assembly and general tweaking to be done. Got all those ball levers, and the wheel collets and tool holder done this autumn, just before it became too cold.

In the last few weeks I have filled, primed and wet and dry rubbed down the machined castings, four sessions of that, then a couple of coats of Tom Senior green paint ( I had some! ), similarly rubbed down; and now a final green coat. In truth, they are not anything like perfect now, but for a working Quorn they will do, I think. Any straying paint will be cleaned up in the assembly.  With my workshop basking at around zero degrees, and the new paint benefitting from sitting on the radiators indoors for a while anyway, the putting together will have to wait for a bit.

I have a little query about the electric wiring, when I am later able to do it.    I will follow the diagram in Prof Chaddock's book, as per the photo.  I have a centre off, two way switch to suit.   The diagram shows two white leads coming from the large capacitor:  mine as supplied has a brown and a blue lead. Shown in other photo. I get the feeling, but would be glad of confirmation, that I can wire these leads as if they were just the two undifferentiated white leads in the diagram, and that which goes where will only affect the running direction of the motor.  And can be swopped if necessary to make the direction accord with the switch?

When the Quorn does finally come together as a machine, I'll bung up some pictures and some build photos .  Dave



Online Jo

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Re: Quorn grinder build finally coming onto the home straight...
« Reply #1 on: January 24, 2023, 11:59:09 AM »
Hi Dave,

That looks very smart  8)

If you read the print on the outside of your capacitor it explains that to reverse the direction motor runs you reverse the leads on the starting capacitor. You will get the same effect by swopping over the two wires for the running winding.

Jo
Enjoyment is more important than achievement.

Offline vtsteam

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Re: Quorn grinder build finally coming onto the home straight...
« Reply #2 on: January 24, 2023, 01:43:29 PM »
Looking forward to final assembly and use. I like the color very much!  :ThumbsUp:  :popcorn: :cheers:
Steve

Offline Chipswitheverything

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Re: Quorn grinder build finally coming onto the home straight...
« Reply #3 on: January 24, 2023, 04:12:19 PM »
Hello Jo, thanks for your comment, ( and the encouragement from vtsteam as well ).  What you have said about the wiring , and the capacitor printing, not that easy to read all of it, indicates to me that I will be OK to wire as I planned to do. Dave

Online Kim

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Re: Quorn grinder build finally coming onto the home straight...
« Reply #4 on: January 24, 2023, 05:53:13 PM »
Nice paint job!  And LOTS of handles!  :o

You're going to have a very nice Quorn there!  :ThumbsUp: :popcorn:
Kim

Offline Charles Lamont

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Re: Quorn grinder build finally coming onto the home straight...
« Reply #5 on: January 24, 2023, 09:30:37 PM »
That all looks very fine. Excellent choice of colour, IMHO.

Offline Del_61

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Re: Quorn grinder build finally coming onto the home straight...
« Reply #6 on: January 25, 2023, 07:01:31 AM »
I am not at quite at the same stage as you on my Quorn build, but as I also have a tin of Tom Senior green I was going to use that on my Quorn as well. Tomm Senior green looks good doesn't it !

I purchased a mk2 set of untouched castings and I am building mine to the mk3 instructions and drawings. I am using the split cotter arrangement rather than slitting the castings.

To power the thing I purchased from the well known auction site a parvalux 3 phase motor and will use this control speed, forward and reverse direction.

Good luck with your Quorn !

Offline Chipswitheverything

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Re: Quorn grinder build finally coming onto the home straight...
« Reply #7 on: January 25, 2023, 09:25:22 AM »
Thanks for the comments, and appreciation of the colour!   If I was making the Quorn now, then I would have adopted the cotter arrangement rather than the slitting way : the big lumps were all done way back and soon after I had bought the castings, the discussions on the Quorn builder's forum and elsewhere as to the merit of using cotters had not come my way.  I did have some closure of the bores after the splitting was done, a bit of a nuisance.  When I built a second pillar tool and mini drill some years later on, I did use brass split cotters on all the bores in that, as GHT had specified, and they were very satisfactory.

  When I machined the bronze casting for the Quorn tilting base a few years ago, I did include a split cotter in that component, and also did the well-known mod. to the rotating bolt, using the conical seatings and tapered / split collets that make it much more secure. Dave

Offline Del_61

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Re: Quorn grinder build finally coming onto the home straight...
« Reply #8 on: January 25, 2023, 01:04:04 PM »
Yes I did the mods to the tilting base and the rotating base was built up from two separate slabs as per Hemingway's mk3 design.

The last real big component on my build is the spindle which to be honest I have a lot of trepidation about......

I also built GHT pillar tool and drill attachment as well as the headstock and vert dividing head attachments.....all have been used on the build of the quorn

 

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