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Author Topic: Core drill motor on last legs.  (Read 2550 times)

mlappin

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Core drill motor on last legs.
« on: October 16, 2017, 02:03:10 PM »

Don’t think my core drill motor has much life left, was a generic anyways so not worth rebuilding. My base however is solid and I have a Bridgeport so making an adapter plate to fit any brand to it isn’t a big deal.

I can get a Milwaukee 15 amp model that handles a 5 inch bit with clutch for $699 new.

I’ve also found a used three speed Hilti that will handle a 6 1/2” bit for $450, no mention of a clutch. Pulls 18 amps. Of course the Hilti will need a hundred dollar adapter to go from splines to threaded.

I’m kinda leaning towards the 15 amp as most homeowners won’t have a 20 amp circuit available most of the time. Currently unless they have an outdoor outlet right at the spot I’m working I’ve been using my generator to run the drill which of course is just one more thing to haul around.

To those that might have used one or both before, what say you? Trying to rent one around here is futile, most of the time construction companies or paving crews have em for months at a time.
« Last Edit: October 16, 2017, 03:38:23 PM by mlappin »
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stmftr

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Re: Core drill motor on last legs.
« Reply #1 on: October 16, 2017, 04:18:30 PM »

We use to buy Milwaukee's and have a few left in service. We now use Husquvarna which are very simmular Hilti. The are way nicer to use. They are alot easier to mount to a wall and they have nowhere the slop between the brass pads and the base like the Milwaukee's do. If you are in a tight spot the machine pulls directly off the base unlike the Milwaukee 2hich you need to take it off the end of the base.
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mlappin

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Re: Core drill motor on last legs.
« Reply #2 on: October 16, 2017, 04:36:46 PM »

Like I said it’s my own base that I’ve modified, instead of mounting behind the mast I now have a “horseshoe” that actually goes to either side of the core bit so I can actually anchor where the pull is. It will also come off the end instead of having to disassemble the mast off the base.

I also have a ammeter coming that I’ll be mounting in a box at the end of a heavy extension cord I’m putting together. Was used for running a five hp single phase motor at a rental farm. Wanting to say its 6 gauge 3 wire SO cord, even 8 would be better than what you can buy.
« Last Edit: October 16, 2017, 05:04:46 PM by mlappin »
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hoardac

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Re: Core drill motor on last legs.
« Reply #3 on: October 16, 2017, 07:22:53 PM »

In my experience a clutch is a good thing.
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stmftr

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Re: Core drill motor on last legs.
« Reply #4 on: October 16, 2017, 07:46:09 PM »

I'm just saying that Milwaukee core rigs are a lot like Ridgid 300 pipe threaders. They have been around for a long time and last quite a while but there are better options out there.
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mlappin

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Re: Core drill motor on last legs.
« Reply #5 on: October 17, 2017, 01:58:06 PM »

Okay, homemade base for the core drill worked fantastic, could practically jump up and down on it and zero movement.

However still having issues getting thru the blasted granite. Drill speed is too high and keeps glazing the cutters. Gonna try the silica sand trick and see what happens. I have the Hilti coming, it has a much more suitable speed for a 5” core bit, when I make the adapter I’ll have to make sure the old one and the Hilti have the drives the same height so I don’t have to remount the base.

Anybody ever use a core drill specifically for granite?
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E Yoder

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Re: Core drill motor on last legs.
« Reply #6 on: October 17, 2017, 03:43:08 PM »

We got a bosch hammer drill that runs circles around the old Makita we had.  Has a different pulsing hammer.
Probably not as big as you describe but a 5" core bit goes through pretty fast- in concrete. :)
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mlappin

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Re: Core drill motor on last legs.
« Reply #7 on: October 17, 2017, 05:19:46 PM »

We have one of those as well, both the bosch hammer drill and dad has a 5 inch core bit, works fine in concrete or block, forget it in field stone. I bought a brand new Bosch four flute carbide bit for the rotary hammer, the granite just laughed at it. I’m using a 1/2 diamond core bit to get the anchors in, if the plug doesn’t break off at the bottom of the hole, then the new bit in the rotary hammer will shatter the stone as deep as the diamond bit went then nothing.
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Re: Core drill motor on last legs.
« Reply #8 on: October 18, 2017, 04:14:59 AM »

Yeah, you're in a different thing with granite.
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mlappin

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Re: Core drill motor on last legs.
« Reply #9 on: October 18, 2017, 09:48:53 AM »

Well sometimes the internet isn’t completely full of crap. Found a fifty pound bag of silica sand, threw a couple of cupfuls in the hole in the wall, turned water down to a trickle, ran the bit in, did that two or three times then it finally started cutting. Found anytime it seemed like feed speed was dropping off, bring it back out and some sand in the hole, some more in the bit itself. With the trickle of water when the sand did start to come out it would pack a little around the core bit and act as a dam to keep more slurry in the hole. Went 5 inches or better repacking the hole with sand about every inch, finally got thru the rock then speed picked up drastically once it was cutting part rock, part mortar. Probably had a rock in the wall 10-12 inches in diameter and of course that’s where I decided to drill.
« Last Edit: October 18, 2017, 09:51:46 AM by mlappin »
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mlappin

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Re: Core drill motor on last legs.
« Reply #10 on: October 22, 2017, 07:42:18 AM »

I picked the Hilti up, weighs at least twice as much as the one I have.

Some pictures of that wall and my redneck base. Ignore the crooked holes, the tubing I used already had some holes in it from another project. The feet for the stabilizer bolts were either 1/2” stainless and I drilled a hole part way thru or welded a nut to the thinner ones so they can’t come off the ends of the stabilizer bolts.


Core Drilling by Marty Lappin, on Flickr

Yep, the middle section is what took forever, was one big rock in the middle of the wall, the last 8” was a piece of cake, after I drove to town and picked a 12” extension up.

Core Drilling by Marty Lappin, on Flickr


Core drilling by Marty Lappin, on Flickr
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