 Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me. |
Forum Index : Microcontroller and PC projects : Cutting 3mm threads....
  Page 3 of 3 |
|||||
| Author | Message | ||||
disco4now Guru  Joined: 18/12/2014 Location: AustraliaPosts: 844 |
I ordered this one to see what they are like. Could not help myself Regards Gerry Latest F4 Latest H7 |
||||
Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9082 |
Please let us know how it goes! Smoke makes things work. When the smoke gets out, it stops! |
||||
redrok Senior Member  Joined: 15/09/2014 Location: United StatesPosts: 209 |
Hi All; palcal; The thread forming taps should be readily available. Maybe the name is a bit different down under. There are self tapping screws. 1. Thread Cutting Screw type for sheet metal. The end of the screw has a sharp cutting edge 2. Thread Forming Screws look similar to the taps. Bill7300; 1. The formed treads are similar to rolled threads in they are deformed metal. 2. Generally the thread is work hardened due to metal deformation. 3. The metal in the thread is denser due to compression. 4. Since no cutting is done there aren't stress induced cracks. disco4now; That looks like mine. My machinist friend says that if tapping by hand you might want to use a slightly larger drill bit than the recommended bit. He uses his CNC mill which has perfect alignment. When hand tapping the alignment my not be so accurate. The slightly larger drill bit allows for less accurate alignment although the resultant threads will be not as fully formed. He also says that since switching to thread forming taps he has greatly reduced the breaking of taps. Personally, I have never broken any. redrok AD0TJ |
||||
| Jak Cuttle Newbie  Joined: 27/08/2016 Location: AustraliaPosts: 3 |
Hi Grogster, I have cut many a 3mm thread in Aluminium in my early years and found that like you using a drill press is excellent for getting it straight but I have a small tommy bar 8 inch long (sorry, 200mm)that fits neatly in the chuck key holes and I wind the drill press by hand, usually a third of a turn at a time and back off the same, run it back into the third a couple of times before advancing another third of a turn (dont forget to remove the tommy bar before using the drill!) Kero works well as a lubricant - lots of it! Hope that helps |
||||
| Phil23 Guru Joined: 27/03/2016 Location: AustraliaPosts: 1664 |
Slightly off topic, but I've been meaning to get one of these; instad of borrowing it occasionally. A lot more things would get assembled better if I had a kit on hand to make treads for stand-offs etc in cases. Rivet Nuts. The guy that owns the one I've borrowed says it's a very well used tool in his workshop. Cheers Phil.   Nut Pack. Tool. |
||||
| Bill7300 Senior Member Joined: 05/08/2014 Location: AustraliaPosts: 158 |
I have one Phil, although a different brand and mine came in a kit with steel nuts rather than aluminium for which I really have far greater need. As a result, I have only used mine once in about 15 years. I really must re-equip with aluminium. I note though that the Nut Pack link you quote is somewhat confusing in describing the nut pack as Stainless steel M... aluminium? Bill Bill |
||||
| Phil23 Guru Joined: 27/03/2016 Location: AustraliaPosts: 1664 |
Yeah, Just grabbed the first link that listed appropriate sizes, didn't notice that bit of it. Haven't ordered anything, but will watch out for such errors. |
||||
| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9082 |
An interesting idea. Smoke makes things work. When the smoke gets out, it stops! |
||||
MicroBlocks Guru Joined: 12/05/2012 Location: ThailandPosts: 2209 |
I have used those rivet nuts a lot in my days when i built camper vans. They work great and small versions could be used for pcb's and enclosures. Microblocks. Build with logic. |
||||
| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9082 |
BUMP!  How did you get on with the one you ordered, Gerry? Did it work? Smoke makes things work. When the smoke gets out, it stops! |
||||
| disco4now Guru Joined: 18/12/2014 Location: AustraliaPosts: 844 |
Well it took me a while to find it. I tapped a couple or threads in 3mm aluminum and they seem ok. The tap is HSS so that OK, but when I look at the ebay listing what they have sent is not what is shown. They sent me a normal tap not the thread forming one they show. Should have had a closer look when I go it. Could be an honest mistake but not much I can do about it now, even if I noticed at the time with the return postage it would have not been worth trying to get the correct one. So sadly I cant say how one would have worked. Found a use for and old drill chuck though  Regards Gerry Latest F4 Latest H7 |
||||
BobD Guru Joined: 07/12/2011 Location: AustraliaPosts: 935 |
[quote]They sent me a normal tap not the thread forming one they show.[/quote] If you used PayPal I think that you get 180 days now to make a complaint (open a dispute) and PP will / may pay the return post. I'm not able to confirm this right now but I'm sure that you could easily find it on the PP web site. Anyone else able to inform us on this? |
||||
| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9082 |
Oh, OK.  I will order one then, and see if they send me the correct thing, or just a tap like you got. Smoke makes things work. When the smoke gets out, it stops! |
||||
| Phil23 Guru Joined: 27/03/2016 Location: AustraliaPosts: 1664 |
Hmmm, Just did a search for 3mm thread forming tap & notice that the Chinese consider most taps to be thread forming. One listing was clearly a 10mm 3 fluted tap. "Fluteless tap" and "Thredflo tap" give a few hits, must be a Sutton TM. A Sutton Thredflo, Pretty Exxy @ $65.00. Phil. |
||||
| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9082 |
Yes, I am curious as to what I will receive. If it is NOT a thread-forming tap, I will email the seller. Smoke makes things work. When the smoke gets out, it stops! |
||||
| Page 3 of 3 |
|||||
 Print this page |
