Board logo

How large a compressor for an impact wrench?
garyo - 11/7/18 at 09:05 PM

I've just burnt out my electric impact wrench, and my previous cheapo electric one destroyed its gearbox before that, so fancy trying an air one. Will my existing compressor be capable of running one?

I have one of these 24 litre Sealey ones:

https://www.screwfix.com/p/stanley-8216035scr011-24ltr-compressor-with-5-piece-accessory-kit-240v/48089

Cheers

Gary


ian locostzx9rc2 - 11/7/18 at 09:17 PM

You will need a bigger compressor at least 100 ltr tank and 13 cfm compressor to use a decent air wrench


Slimy38 - 11/7/18 at 09:20 PM

I have a compressor similar to that Sealey one, I get maybe one or two thumps out of an air gun before it has to recharge. I bought myself a Clarke mains powered one and it seems to do a much better job.


CosKev3 - 11/7/18 at 09:28 PM

quote:
Originally posted by ian locostzx9rc2
You will need a bigger compressor at least 100 ltr tank and 13 cfm compressor to use a decent air wrench


This/

13CFM minimum, 15 if you can


luke2152 - 11/7/18 at 09:57 PM

Depending on if its for undoing difficult tight stuff or for undoing everything I would say that hose size is far more important than compressor size. And yes a small compressor will quickly run out of air using a decent rattle gun.


MikeR - 12/7/18 at 06:33 AM

What are you hoping to get?

I use a 2hp 25l and it's ok. But I work in bursts and accept it needs to run to recharge.


theconrodkid - 12/7/18 at 06:39 AM

what impact gun you got, i have one here with 2 dead 24 volt batteries gathering dust


garyo - 12/7/18 at 06:57 AM

My current one is 230v and claims 480lbft. I'm stuck on a mondeo crank bolt that's loosened 3 turns then hit stuck on its thrrsdlock. They have a reputation for being tight.

I think maybe I need to use some heat too, or more of an in/out technique.

I've left it with a slosh of plus gas to see if that helps.


theconrodkid - 12/7/18 at 07:15 AM

heat destroys threadlock so give that a bash


nick205 - 12/7/18 at 08:24 AM

quote:
Originally posted by theconrodkid
heat destroys threadlock so give that a bash



2nd that - I've overcome threadlock before with a bit of heat from a plumbers type blow lamp.


garyo - 12/7/18 at 08:32 AM

Excellent - cheers chaps. I have a proper plumbers Rothenburg so I'll but a new 240v one for now and give that a shot.

I stripped down the dead one yesterday - motor windings melted from over-work. It was one of these - sold under various brands:

[url=https://www.machinemart.co.uk/p/clarke-cew1000-electric-impact-wrench/]https://www.machinemart.co.uk/p/clarke-cew1000-electric-impact-wrench/[/ur l]


Bluemoon - 12/7/18 at 10:46 AM

quote:
Originally posted by garyo
Excellent - cheers chaps. I have a proper plumbers Rothenburg so I'll but a new 240v one for now and give that a shot.

I stripped down the dead one yesterday - motor windings melted from over-work. It was one of these - sold under various brands:

[url=https://www.machinemart.co.uk/p/clarke-cew1000-electric-impact-wrench/]https://www.machinemart.co.uk/p/clarke-cew1000-electric-impact-wrench/[/ur l]


Probably rated for low duty cycles.... manual should state maximum duty cycles ie operation time and rest time


rusty nuts - 12/7/18 at 05:34 PM

I picked up a bare 18v Dewalt impact gun at Stoneliegh for 140 , seems to have as much torque as my SnapOn air gun , well impressed for the price.


perksy - 12/7/18 at 08:23 PM

I've used a hot air gun previously to help remove the crank pulley bolt on C20XE engines and they are renown for being difficult to shift

[Edited on 12/7/18 by perksy]


garyo - 13/7/18 at 09:52 PM

The blowtorch and a new gun shifted it :-)