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Myford Super 7 Toolpost issue

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Matt Harrington06/05/2021 23:16:01
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Jason, I'm interested to know why my last post was edited by you.

Matt

Matt Stevens 107/05/2021 13:13:58
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Hi All,

So i have been in contact with Myford and they have suggested i purchase the Myford ML10 QCTP kit.....apperently the only difference between the 7 series and ML10 QCTP is the relief that is cut out on the ML10 holder to allow them to sit lower. He said the website claims 2mm relief but in reality it is 4mm which is just enough to accommodate 1/2" tooling.

If the above it true, it makes for an east fix for any Myford 7 series....however i am still wary because i don't understand why they wouldn't just sell that one kit for all lathes promoting its advantage on the 7's.

Matt Harrington07/05/2021 13:20:20
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The only disadvantage is that the tool post needs to be oriented so that the holder drops below the level of the top of the top slide. This means you can't orientate the tool post to an angle - but you can orientate the slide - if that makes sense.

Matt

SillyOldDuffer07/05/2021 14:03:08
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Posted by Matt Stevens 1 on 07/05/2021 13:13:58:

...

He said the website claims 2mm relief but in reality it is 4mm which is just enough to accommodate 1/2" tooling.

If the above it true, it makes for an east fix for any Myford 7 series....however i am still wary because i don't understand why they wouldn't just sell that one kit for all lathes promoting its advantage on the 7's.

Myford/RDG would know for sure, but I suspect it's because they don't want to commit to anything outside the lathe's specification.

As Myford Super 7 lathes weren't designed or intended to be used with 1/2" tooling any customer who wants to do that is outside the normal support envelope.

For legal reasons suppliers are generally unwilling to take responsibility for modifications that might not work, especially if the amount of relief available on a bought in ML10 QCTP might vary from batch to batch.

Is there an engineering reason for wanting to fit oversized tooling to a small lathe? Though my Chinese lathe would take 1/2" shanks, I use 12mm. I've no desire to upgrade the machine to take 15mm tools. Expensive to do for not much return, if any.

As big knives are clumsy on small jobs I'm as likely to turn with 10mm tools as 12mm, and often get into small gaps with 8mm. If the work really requires 1/2" tooling, I suggest buying a bigger lathe. Then the whole machine is scaled to take the strain, not just the oversized cutter.

Dave

Zan07/05/2021 14:10:30
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I use 8 mm tooling and have reduced 1” to nothing in two cut,s, but it’s pushing the machine too much, and was just about seeing what it could do. Now I would use use three The 7 series are small lathes and don’t warrant anything bigger. I use exactly the same tooling in my Colchester student without much problem with decent sized cuts

Zan07/05/2021 14:10:31
313 forum posts
20 photos

I use 8 mm tooling and have reduced 1” to nothing in two cut,s, but it’s pushing the machine too much, and was just about seeing what it could do. Now I would use use three The 7 series are small lathes and don’t warrant anything bigger. I use exactly the same tooling in my Colchester student without much problem with decent sized cuts

Matt Stevens 107/05/2021 14:34:10
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Posted by SillyOldDuffer on 07/05/2021 14:03:08:

Is there an engineering reason for wanting to fit oversized tooling to a small lathe? Though my Chinese lathe would take 1/2" shanks, I use 12mm. I've no desire to upgrade the machine to take 15mm tools. Expensive to do for not much return, if any.

Hi Dave,

The reason i want to use 12mm (1/2" tooling is that - thats what i have already!

However it is a fair point to say - will it be cheaper to buy a new QCTP system or to buy a complete new set of carbide tooling from China.....hmmmm

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