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Old 22nd June 2006, 10:55 AM   #1
Nam402 is offline Nam402  United Kingdom
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Default SME graunching

Hi folks,

I've noticed that the little grub screws for adjusting SME arms can be easily graunched. The readily available 1.5mm hex keys are a loose fit in the screw socket, and if there is already some wear there could be a problem with a tight one. No adjustment!

I had a close call with my arm, and am now very careful not to overtighten.

Did SME provide a custom key for their arms? Can we get them?

Cheers, Nam

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Old 22nd June 2006, 11:33 AM   #2
sreten is offline sreten  United Kingdom
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Hi,

Its because SME use AF sizes not metric.

Click the image to open in full size.

Available from your local "everything a pound" shop.

/sreten.
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Old 22nd June 2006, 02:01 PM   #3
Nam402 is offline Nam402  United Kingdom
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Thanks Sreten; that was easy!

Cheers, Nam
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Old 22nd June 2006, 06:33 PM   #4
Nam402 is offline Nam402  United Kingdom
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Default SME graunching update

Hi Sreten and folks,

I've tried the Blackspur keys.

Unfortunately this 'small' matter is a little more complicated than I thought. Under a glass with micrometer, the 1.5mm and 1/16" keys are identical, and both are too small in section for the SME grubscrews, the same goes for Proskit 1.5mm keys of course, which are a little sharper in section than the Blackspur but still too small.

There is a company, I don't know if I can mention them here, who supplies AF keys measured in mms across the flats. They have 1.5mm and 1.6mm AF and I am going to try these.

Given the value and collectability of some SME arms, and the problem of stuck grubscrews, I think it's worth getting just the right keys.

Lucky I caught mine in time, before it was too late!

Cheers, Nam
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Old 23rd June 2006, 11:18 AM   #5
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can you get the grub screw out?
If so, get a small bolt that fits, grind the end to a point (i assume the origional grub screw has a point), cut it to length (cutting the bolt head off) and cut a slot in the end so you can use a small screw driver.
Just a thought, without owning this are, or seeing where the screw is, but ive replaced a few grub screws this was.
Small allen head bolts/grub screws are prone to rounding out.
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Old 23rd June 2006, 04:08 PM   #6
EC8010 is offline EC8010  United Kingdom
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Quote:
Originally posted by graeme uk
Small allen head bolts/grub screws are prone to rounding out.
Only if you don't use the correct key! Try an engineering shop rather than a cheap and cheerful shop. They will have more choice and better quality. As far as I remember, the SME uses British Association grub screws (6BA).
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Old 23rd June 2006, 05:24 PM   #7
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I am using a standard allan key set (imperial sizes) on both of my sme arms w/o any problem.
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Old 26th June 2006, 07:42 AM   #8
Nam402 is offline Nam402  United Kingdom
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Hi audio-kraut,

When you insert the key into the screw, try checking how much play there is. With mine, and the 1.5mm Proskit key or 1/16" equivalent, I can turn the key a quarter turn without resistance. This is very sloppy. On tightening, I found that the key slipped round under pressure, and I didn't try it again. Under a glass, there is only a little graunching so far.

I'm still waiting for some specialist keys to arrive in the mail.

Cheers, Nam

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Old 26th June 2006, 09:12 AM   #9
Nam402 is offline Nam402  United Kingdom
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Default SME graunching - problem solved!

Hi folks,

I have obtained some keys from a model engineering company.

These are 1.6mm AF hexagon keys and are a snug fit with the SME. They would probably even work with worn grubs.

Looking at the standard 1.5mm or 1/16" keys there is a big difference even to the naked eye; these custom keys are much more substantial.

If anyone wants the link, just PM me. The keys were 50p each plus p&p.

Cheers, Nam
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Old 26th June 2006, 11:21 AM   #10
sreten is offline sreten  United Kingdom
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Hi,

Well the Blackspurs claimed to be A.F. sizes, obviously not. Seems
that you get what you pay for. An AF set should have these sizes :

1/16" 5/64" 3/32" 1/8" 5/32" 3/16" etc i.e. they are imperial.

/sreten.
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