 | Home > Maintenance & Modifications > Unwanted Engineering Challenge |
 
|
|
|
| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324  
|
I've fitted a nice new bumper to my 90 that includes a central towing point but it didn't come with a pin. I've then bought the shortest pin I could find, which is still too long, with the intention of drilling a new hole for the retaining pin and cutting the end off. But this is where it's all gone wrong.
I set the pin up in my pillar drill and started the new hole with a 2mm bit but got about half way through and the bit snapped. It's done so below the surface, so there's nothing to get a hold on. I tried drilling it out with a slightly larger bit but it wouldn't touch the drill material. I've then carefully drilled from the other side of the pin in the hope that I could knock the remains of the drill bit through, but it won't budge at all. So, in summary, I've got a 25mm diameter steel pin with the remains of a 2mm drill bit embedded in it to about half way through, and a 6mm diameter hole from the other side to the tip of the drill bit. I've currently got the pin in the freezer in the vain hope that I can shrink it enough to loosen its' grip on the drill bit remains, but I'm open to other suggestions! Darren 110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
||
26th Apr 2017 8:09pm |
|
| JAY BOY Member Since: 04 May 2010 Location: Not here Posts: 1706 
|
Get a load of heat into the pin. The steel will expand and the drill bit should come out.
|
||
|
26th Apr 2017 8:17pm |
|
| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
|
That's a possibility. It's a big lump of steel though, so getting a lot of heat into it could be a challenge. I suppose I could put it in the oven... Darren
110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
||
|
26th Apr 2017 8:20pm |
|
| JAY BOY Member Since: 04 May 2010 Location: Not here Posts: 1706
|
I was thinking more like a blow torch. You would need to get the drilled area cherry red and i will come out
|
||
|
26th Apr 2017 8:22pm |
|
| zsd-puma Member Since: 09 Aug 2016 Location: Kent Posts: 2720 
|
wont one of these fit?
https://www.pfjones.co.uk/replacement-pin-...11900.html |
||
|
26th Apr 2017 9:06pm |
|
| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17372 
|
Several options:
1. Get a new pin, ideally of the right length! 2. Find someone with a spark erosion machine. 3. Using a pointed punch at the bottom of the 6mm hole, belt the bejasus out of it in the hope of bursting through and knocking the fragment out. 4. Heat the pin with oxy acetylene or oxy propane gear in the hope of expanding it enough to free off the fragment. You will never be able to drill out a broken drill bit, it simply cannot be done. Spark erosion is one of very few ways to get rid of one. |
||
|
26th Apr 2017 9:28pm |
|
| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
|
Ok, thanks chaps. I think I've got a blow torch at the back of the garage somewhere so will have a rummage tomorrow evening. Darren
110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
||
|
26th Apr 2017 9:28pm |
|
| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
|
Unfortunately not. It's about 5mm too short. Darren 110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
||
|
26th Apr 2017 9:29pm |
|
| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
|
Buying a new pin and starting again could be my last resort. Unfortunately I can't find one off the shelf that's closer to the right length. With a bit of fettling, I've made the pin from my DB ball and pin tow hitch fit, but it's not ideal. The next standard size up is the one I've bought, but it's about 1.5 inches too long. I'll try some heat and see how it goes. Darren 110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
||
|
26th Apr 2017 9:35pm |
|
| Farmer58za Member Since: 20 Jan 2017 Location: Worcestershire Posts: 85  
|
If you have a 6mm hole through from the rear, then the way to get through to the end of your 2mm drill is to take a Dremel (die grinder) with a small stone to grind through and then take a pointed drift or punch and try to drive out the drill. Once you get the drill to move (a bit) you can take a 2mm welding rod and gently tap the drill out. Dave's not here man...
|
||
|
26th Apr 2017 9:43pm |
|
| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
|
Thanks for the idea. I can see the end of the bit in the 6mm hole, but belting seven bells out of it with a punch hasn't got it to move at all yet. Darren
110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
||
|
26th Apr 2017 9:46pm |
|
| Farmer58za Member Since: 20 Jan 2017 Location: Worcestershire Posts: 85
|
Ok, if you can see the drill at the bottom of the 6mm hole, try the 2mm welding rod. Dave's not here man...
|
||
|
26th Apr 2017 9:49pm |
|
| LR90XS2011 Member Since: 05 Apr 2011 Location: bickenhill Posts: 3641 
|
chances are its jammed by swarf/cut metal, when you are hitting it out you from the opposite side you will be making it tighter, drill 6mm from the original side until you meet the broken drill and then hit it from the original side with something towards your opposiet side 6mm hole, then knock it back and forth from each end drilling a bit deeper with the 6 mm each time it moves, you will win DEFENDER 90 TDCI XS,
I hope everyone is well and your land rovers make you happy |
||
|
27th Apr 2017 4:38am |
|
| Pilgrimmick Member Since: 16 Nov 2015 Location: Highlands Posts: 582
|
Is it an ex-military bumper? 80" 1948
Lightweight V8 Bowler Tomcat 130 Station wagon 90 300tdi (Santana PS10 pick up) Range Rover L322 (Ful fat) |
||
|
27th Apr 2017 5:25am |
|
|
|
| All times are GMT |
< Previous Topic | Next Topic > |
Posting Rules
|
Site Copyright © 2006-2024 Futuranet Ltd & Martin Lewis
