Warn Rear Bumper needs 1 1/2 hole for Spindle - JeepForum.com
 
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post #1 of 12 Old 10-12-2009, 05:59 PM Thread Starter
hogelectra
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Warn Rear Bumper needs 1 1/2 hole for Spindle

I'd say the rear bumper is 3/16 steel and I need to drill a 1 1/2 hole through top and bottom for a spindle for my tire carrier

I have a table drill press but the 1 1/2 hole is something new to me.

Two holes - one top and one bottom

hole saw or drill bit

that large of drill bit scares me.

Need advice

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post #2 of 12 Old 10-12-2009, 07:17 PM
limegreentj
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im doing this for a friend right now....its harder than you think, we used a hole saw top and bottom...then you have to torch cut it out because its welded in the back. when i go back down to the shop ill take a pic.
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post #3 of 12 Old 10-12-2009, 07:21 PM
Kenbo-Slice
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I used a drill bit in a milling machine when I built my bumper. If you have access to a milling machine or know someone who does I would use that. It is as precise as it gets.

Jeep build up...ONGOING
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post #4 of 12 Old 10-12-2009, 07:46 PM
wushaw
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Hole saw & drill press.
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post #5 of 12 Old 10-12-2009, 08:54 PM
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post #6 of 12 Old 10-12-2009, 09:12 PM
472cid
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i used a lenox hole saw for mine went right through with drill press and some lube

1997 Jeep Wrangler 5.0 ho gt40p motor w/ e303 cam, ax15 trans. 241j rock trac transfer case from 05 rubicon. 05 front rubicon 44 with yukon chromoly shafts and rear rubicon dana 44 and rubicon rims with 33x11.50x16 mtrs
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post #7 of 12 Old 10-12-2009, 09:22 PM Thread Starter
hogelectra
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did you weld the spindle on the outside of teh bumper
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post #8 of 12 Old 10-12-2009, 09:23 PM
Kenbo-Slice
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^^ Who is that directed to?

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post #9 of 12 Old 10-12-2009, 09:30 PM
Jim1611
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The problem you will have if you try to drill the 1 1/2 hole with a drill bit on your drill press is that most drill presses in home shops don't go slow enough. What will happen is you burn a $40.00 drill bit up and be frustrated. If you can get the bumper off mark where you want the hole and take it to a machine shop, or even a vo-tec class and have them drill the hole for you on a mill of some kind. You end up not buying a drill bit that way and get a good job at the same time.
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post #10 of 12 Old 10-12-2009, 09:42 PM
chet44
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If I didn't have access to a mill I'd probably go with the hole saw and water soluble lube. In a "home" drill press, I'm betting the slowest RPM is about 150-200 (At least it is on my Dad's). At work I would run a 1-1/2" drill as slow as our drill press goes (44/77 RPM). Water soluble oil will cool as much as it lubricates, which is important using a hole saw with a lot of cutting edges that is spinning faster. I would worry more about a drill bit grabbing (and whipping your arm around with it) than I would about burning up the drill. Just layout your holes on each side, and go slow. When you get to the point the saw is about to break through, go really slow. IF the hole saw is going to grab, it will most likely do it when you are about to break through.
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post #11 of 12 Old 10-12-2009, 11:41 PM
ChiliPalmer
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Quote:
Originally Posted by chet44 View Post
If I didn't have access to a mill I'd probably go with the hole saw and water soluble lube. In a "home" drill press, I'm betting the slowest RPM is about 150-200 (At least it is on my Dad's). At work I would run a 1-1/2" drill as slow as our drill press goes (44/77 RPM). Water soluble oil will cool as much as it lubricates, which is important using a hole saw with a lot of cutting edges that is spinning faster. I would worry more about a drill bit grabbing (and whipping your arm around with it) than I would about burning up the drill. Just layout your holes on each side, and go slow. When you get to the point the saw is about to break through, go really slow. IF the hole saw is going to grab, it will most likely do it when you are about to break through.
X's 2. Head to Lowes and pick up a 1.5" Lenox bit for $10 to $15 and drill the hole. It's really not that hard. As mentioned above - go slow and hold on when you get towards the end. Once you've marked where you want to drill it should take you less than 5 minutes to drill those 2 holes...



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post #12 of 12 Old 10-13-2009, 07:15 AM
BESRK
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I've built about 500 bumpers using a 1.5" hole saw to bore the spindle hole... in 3/16" material. One hole saw will last me about 50-75 bumpers or so..

Use a machinist's square to scribe a line around the bumper. Use a good center punch to dimple for the drill and use lube... tranny fluid will do in a pinch.

'80 CJ5 w/AMC360, T176, D44 w/Detroit 4.56, RE 4" YJ lift and 35s..



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