Inleiding
Hoe een beschadigd schroefgat in aluminium opnieuw van schroefdraad voorzien.
Wat je nodig hebt
-
-
Bepaal welk gat beschadigd is.
-
Bepaal de grootte van de huidige schroefdraad. Metrische schroefdraad wordt aangeduid met M, dan de buitendiameter, een kruisje en vervolgens de spoed. De getoonde tap is bijvoorbeeld M4 x 0,5.
-
Selecteer de juiste tapmaat.
-
Monteer de tap in het wringijzer (zie foto).
-
-
Controleer na het opnieuw tappen van de beschadigde schroefdraad of de schroefdraad werkt door er een bout of schroef in te draaien.
Controleer na het opnieuw tappen van de beschadigde schroefdraad of de schroefdraad werkt door er een bout of schroef in te draaien.
Annuleren: ik heb deze handleiding niet afgemaakt.
5 andere personen hebben deze handleiding voltooid.
Met dank aan deze vertalers:
100%
Toon Konings helpt ons de wereld te herstellen! Wil je bijdragen?
Begin met vertalen ›
Team
Cal Poly, Team 28-5, Green Spring 2015 Lid van Cal Poly, Team 28-5, Green Spring 2015
CPSU-GREEN-S15S28G5
3 Leden
10 handleidingen geschreven
8 opmerkingen
If the hole is truly stripped then the technique in this guide won't work because the hole would then be larger than it was originally and the tap won't bite into the metal and therefore not cut any new threads. So then there are two options:
.
1. Choose the next larger size bolt and drill and re-tap the hole to fit that larger size. Or if you really must use the same size bolt then:
.
2. Use a helical insert (aka "Helicoil") which is a coil of hardened steel wire that forms both a outer and inner thread.
.
I used option #2 to fix a stripped hole in a bicycle shock absorber. I bought the Helicoil kit sized for my bolt from a automotive supply store. The kit came with the drill bit and tap sized for the outside threads of the coil. I drilled the hole, tapped the threads, then threaded the coil into the hole. The inside diameter of the coil was sized to fit the original bolt.
Don is correct that tapping the hole as it exists won't really work and offered some viable solutions. However, if there isn't enough material for a Helicoil to bite into it won't work either on a through hole and sometimes using a larger bolt isn't an option either. In such cases you can add some filler to your existing hole. JB Weld can work as a filler for aluminum. If you apply a thin enough coating, you can tap the hole after it cures without drilling - then use a Helicoil for strength. Option 2 would be to use an aluminum filler rod and a MIG welder to fill, then drill and tap the hole.
Another option, is to drill and tap a larger hole and drive a threaded rod into the hole, grind both sides off flat, then drill a hole into where the threads mesh and lock the two together with a locking pin, then re-drill and tap a hole to match the original. Its more convoluted, but it’ll work if a helicoil won’t work, and the replacement would be very strong.
(Added info) In my case, I had an m7 hole that stripped out, I had some m12 threaded rod, so I drilled and tapped an m12 hole, drove and locked the m12 rod in place and as mentioned above, ground both sides flat. I then drilled and tapped a new m7 hole. It worked perfectly! :)
