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Thread: Sourcing set screws
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22nd Mar 2019, 04:21 PM #1Senior Member
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Sourcing set screws
Hi guys, (and gals)
Does anyone know where to buy square head set screws M6 x 16.
Only need three. They are for my little lathe tool post.
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22nd Mar 2019, 06:34 PM #2Gear expert in training
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This place always turns up when I'm searching for odd items https://www.smallparts.com.au/store/...ad+categories/
EDTI: looks like they only have imperial..
This mob has M6x20 which you could cut down https://nhtb.com.au/view;jsessionid=...search_refer=Y
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22nd Mar 2019, 09:35 PM #3Senior Member
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Ah great thanks for that. Yeah 4mm difference won't matter.
Newcastle too, only just down the road. Hope their post isn't too dear ... No matter I want them anyway.
Actually that's the place I heard about ages ago and I never found their website so that's a good pick up. We have a local nut and bolt place that changes hands a couple of years ago and the prices skyrocketed. I've been told by a couple of local engineering places that they don't buy from them anymore for that reason. One of the guys told me to go to this place you've mentioned but I forgot what it was called. I appreciate you jogging my memory.
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23rd Mar 2019, 12:23 AM #4
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23rd Mar 2019, 03:10 PM #5Senior Member
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Yeah I'm starting to think that way now. To purchase four little screws from NHTB will cost me more than $23 for post only 100 mile away, that's ridiculous.
I might try ringing them Monday and see if they'll just throw them in an envelope for say $6.
The heads on these screws are 7mm. Can ya get 7mm square bar ?
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23rd Mar 2019, 04:11 PM #6Philomath in training
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You can get 8mm square bar (key steel). Would not take much work with a file to turn them into 7mm if that is what you wanted.
With regards to socket head screws, I would not as they seem to catch swarf, then you can not insert the wrench.
Michael
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23rd Mar 2019, 07:42 PM #7Most Valued Member
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23rd Mar 2019, 08:20 PM #8
Hi Guys,
I only suggested 8 mm square bar because its very cheap and a standard size. In the UK a meter length only costs a couple of pounds. I've also discovered that there is a place quite near me that supplies 3 to 12 mm square, in one 1 mm increments and also in one or three meter lengths, along with various other sections and some tubes in different materials and grades.
Strange how some of these suppliers turn up almost on your doorstep.
Re Cap Screws: Yes I agree they do get swarf caught in them, though I don't find it too troublesome.Best Regards:
Baron J.
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24th Mar 2019, 08:29 AM #9Most Valued Member
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Are your current or past tool post screws hard.
From my experience square head setscrews are case hardened.
If you go down the make your own path don't use mild steel as is , you will find that the end of the screw doing the clamping will start to mushroom.
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24th Mar 2019, 09:37 AM #10Gear expert in training
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All the screws have mushroomed on the QCTPs at work after who knows how many years, doesn't seem to affect their clamping ability though
I could probably get some 4140 out of the scrap bin at work if you want, it'd be round though so you'll have to mill your own flats.
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24th Mar 2019, 10:24 AM #11Senior Member
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The screws that were in the machine were badly mushroomed. The guy that had the lathe before me was way too heavy handed. When I got it, I was surprised to see there were chips in the tray like 30 and 40 mil thick. Obviously it handled it but that's a bit much for a little lathe.
At the garage sale I got him to start it up. There was severe vibration coming from the motor and its pulley was wobbling around all over the place. Turns out the end of the motor shaft inside the pulley was flogged out a few thou and the motor keyway slot shoulder broken away. The motor bearings also shot. The commutator has gone to an engineering shop to braze over the end of the shaft, re-machine and re-cut the keyway. (I don't have oxy equip)
The motor pulley is not like you'd think, it's a rather unique setup. I'll take a photo when I get it back so you can see what I mean.
Hex key screws are terrible for catching swarf. The sockets that hold the combination slide to the saddle on my AL350 fill up and I always have to blow/dig them out to readjust the angle.
I'd prefer 7mm so the key that comes with the machine fits. I thought about using standard hex head bolts and cutting them square but that would be better done with a mill. (something I don't have yet).
Going by the catalog, those screws from NHTB have a 6mm head. Can't win there either.
But then, I found this on ebay :
https://www.ebay.com.au/itm/Keysteel...K2gobVzOHStiOQ
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24th Mar 2019, 10:45 AM #12Senior Member
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24th Mar 2019, 11:04 AM #13
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24th Mar 2019, 07:58 PM #14
Hi Guys,
FWIW key steel is high carbon stuff, similar to O1 silver steel. Easily hardenable in the same way.
The Idea of fitting a brass tip in the screw is a good one ! I've done this a number of times.
20-09-2018-3.JPG
6 mm hex cap screw with a brass tip fitted.Best Regards:
Baron J.
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25th Mar 2019, 08:05 PM #15Senior Member
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