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Quorn Mk3

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Gareth Jones 906/09/2019 10:46:42
17 forum posts

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

Steve King 506/09/2019 11:15:58
55 forum posts
76 photos

Nope but i will now

Thanks

Michael Gilligan06/09/2019 11:55:02
avatar
14023 forum posts
609 photos
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.

devil​​​​​​​

Clive Hartland06/09/2019 14:12:22
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2473 forum posts
40 photos

Plus £61 for the detailed build instructions.

ega06/09/2019 14:20:37
1265 forum posts
108 photos

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".

Neil Wyatt06/09/2019 14:24:22
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Moderator
16579 forum posts
687 photos
75 articles

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

Michael Gilligan06/09/2019 15:29:50
avatar
14023 forum posts
609 photos
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.

Clive Brown 106/09/2019 15:37:14
266 forum posts
7 photos
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

Emgee06/09/2019 17:04:32
1191 forum posts
207 photos

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

Mark Rand06/09/2019 20:47:28
761 forum posts

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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