Quorn Mk3

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Quorn Mk3

This topic has 10 replies, 9 voices, and was last updated 6 September 2019 at 20:47 by Mark Rand.

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6 September 2019 at 10:46 #427750
Gareth Jones 9
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@garethjones9
I notice that Hemingway are now showing a Mk3 version of the Quorn tool and cutter grinder. It is claimed to be easier to set up for grinding and easier to build. Anyone taken a closer look at the Mk3?

Thanks,

Gareth
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6 September 2019 at 10:46 #19454
Gareth Jones 9
Participant
@garethjones9
6 September 2019 at 11:15 #427756
Steve King 5
Participant
@steveking5
Nope but i will now

Thanks
6 September 2019 at 11:55 #427767
Michael Gilligan
Participant
@michaelgilligan61133
Posted by Steve King 5 on 06/09/2019 11:15:58:

Nope but i will now

Thanks

.

+1

… and here's what I found: Quorn – The Mk3 Advantage!

Ref. **LINK**

http://www.hemingwaykits.com/acatalog/Quorn__Mk3__T_C__Grinder.html

Much of which looks like very sensible product development [*]

MichaelG.

.

[*] … one statement is sure to prompt some debate though !!

Hardened and ground ER extension chucks and collets, readily and cheaply available, are used to retain both cylindrical and rectangular items with great precision.
6 September 2019 at 14:12 #427794
Clive Hartland
Participant
@clivehartland94829
Plus £61 for the detailed build instructions.
6 September 2019 at 14:20 #427798
ega
Participant
@ega
As a long term user I was interested in this.

The motor seems new ie not the Parvalux which used to be supplied. I couldn't see anything about speed control which seems a shame.

I would like to see more information on the website before buying the £61 "card".
6 September 2019 at 14:24 #427799
Neil Wyatt
Moderator
@neilwyatt
Now using ER collets – that will upset some!

" Frankly, if you've been thinking about building a Quorn for your own workshop – you've done particularly well to wait until now! "

ROFL!

Mind you Hemmingway have had those patterns for almost as long as some people have had their castings…

Neil
6 September 2019 at 15:29 #427805
Michael Gilligan
Participant
@michaelgilligan61133
Posted by Neil Wyatt on 06/09/2019 14:24:22:

Now using ER collets – that will upset some!

.

…. especially the "readily and cheaply available" variety thereof.

MichaelG.
6 September 2019 at 15:37 #427806
Clive Brown 1
Participant
@clivebrown1
Posted by ega on 06/09/2019 14:20:37:

I couldn't see anything about speed control which seems a shame.

________________________

Didn't the original design deliberately give a fixed top speed within the maximum for the largest wheel and Prof. Chaddock gave some words of warning on this, including the type of motor to be fitted. Also, one function of the belt guards on the Mk. 2, which was intended for commercial use, was to discourage non-standard pulleys.

The new tooth rest looks as if it might be a useful improvement over the original rather awkward affair.

Can't see just how the "unholy" circular tee-slot has been dealt with though.

I think the appeal of the Quorn to the general modeller has reduced since its introduction in the '70's with the availability of fairly cheap cutters, which can be treated as "throw-aways" and TC inserts. There are also simpler T&C grinder designs available.

Also, the 4 flute end-mills on the market now mostly seem to have one cutting lip drawn over-centre, a feature that I've not found a way of deaing with on my Quorn without damaging the other lips.

Clive

Edited By Clive Brown 1 on 06/09/2019 15:38:07
6 September 2019 at 17:04 #427819
Emgee
Participant
@emgee
Nothing new about using ER type collets on a Quorn, been doing it for years with an Emco ER25 collet chuck fitted to an MT2 arbor and another with a 1" shank that fits direct to the head.

Interesting to know some simpler method of setting is available, perhaps someone will share the secret.

Emgee
6 September 2019 at 20:47 #427836
Mark Rand
Participant
@markrand96270
I've got a second-hand set of Quorn castings seasoning on the shelf. One new addition I've made to the set is a set of Martin Models 5C tool holder and spiralling head and tailstock castings with a 2 1/2" height, instead of the standard 2" height. Since I've got a pretty full set of Imperial and metric 5C collets, with square and hex as-needed, I felt that this would be a good modification.

Even with shipping from the USA, the price was reasonable.

Still got to get around to making it though…
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