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Sheet metal hole punch recommendation
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ncpi
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PostPosted: Sat Dec 05, 2020 9:27 am    Post subject: Sheet metal hole punch recommendation Reply with quote

Getting ready to do floor pans. I either want to pick up a cheap pneumatic punch or possibly a hand punch if I need to. My compressor is FL is a small 0.6 CFM.

Pneumatic punches seem to take about 4CFM. Hey, I only have about 30-40 holes per floor. Any idea what kind of cycle time I would have to deal with if I used my 0.6 CFM compressor. I'm not looking to buy a bigger compressor, but if I can punch a hole every 2 minutes it would only take an hour per floor pan Smile

Alternatively, I could buy a hand operated hole punch.
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Bulli Klinik
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PostPosted: Sat Dec 05, 2020 9:39 am    Post subject: Re: Sheet metal hole punch recommendation Reply with quote

I've been using a Roper-Whitney hand punch for years. There is a generic version available for about half the price on Amazon.

As a side-note, I've extended the handles on mine so that I can place it in a vice and have a bit more leverage while punching holes.

https://www.amazon.com/Capri-Tools-CP21050-21050-P...KNKR23V1X6
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ncpi
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PostPosted: Sat Dec 05, 2020 9:45 am    Post subject: Re: Sheet metal hole punch recommendation Reply with quote

Bulli Klinik wrote:
I've been using a Roper-Whitney hand punch for years. There is a generic version available for about half the price on Amazon.

As a side-note, I've extended the handles on mine so that I can place it in a vice and have a bit more leverage while punching holes.

https://www.amazon.com/Capri-Tools-CP21050-21050-P...KNKR23V1X6


That one on Amazon is exactly the one I was looking at. Good to hear the positive feedback. how much hand force does it take to punch thru floor pans (probably 20 Ga.)?

Hand punch and cheap pneumatic are about the same price.
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67ctbug
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PostPosted: Sat Dec 05, 2020 11:47 am    Post subject: Re: Sheet metal hole punch recommendation Reply with quote

I use a Whitney hand punch at work, doesn't hardly take any force at least for the one I use. I'd say about the same as cutting a piece of 20 or 18 gauge with aviation snips. It may be annoying to do floor pans with, but less annoying than waiting for a compressor to catch up.
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infiniteLoop
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PostPosted: Sat Dec 05, 2020 5:47 pm    Post subject: Re: Sheet metal hole punch recommendation Reply with quote

A dual point drill bit (Pilot Point) or a step bit works really good on sheet metal.
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ncpi
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PostPosted: Sun Dec 06, 2020 5:54 am    Post subject: Re: Sheet metal hole punch recommendation Reply with quote

Thanks guys, looks like the hand punch will work. I probably won't drill even though its the cheapest route as I would rather not clean up all the holes.

I still wonder if the pneumatic punch would work well enough on my tiny compressor. Anyone tried it?
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infiniteLoop
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PostPosted: Sun Dec 06, 2020 6:11 pm    Post subject: Re: Sheet metal hole punch recommendation Reply with quote

The air hammers I have do not exhaust my compressor much. I would think a 3.5 and up Hp would work. I believe a air punch;that is hand held anyways , would mostly be dependent on psi and not air flow because you do not do them very fast.
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Bulli Klinik
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PostPosted: Tue Dec 08, 2020 9:41 am    Post subject: Re: Sheet metal hole punch recommendation Reply with quote

ncpi wrote:
Thanks guys, looks like the hand punch will work. I probably won't drill even though its the cheapest route as I would rather not clean up all the holes.

I still wonder if the pneumatic punch would work well enough on my tiny compressor. Anyone tried it?


If your options are a cheapo air punch, I wouldn't bother. The quality units work well but the manual punch will always work. It also gives you the option of different sized holes. I use a couple pieces of pipe to extend the handle for additional leverage on my hand punch. My HF flanger/punch lives in the least opened drawer of my tool box for a reason. Next stop will be the garbage can.

Infinite, if you're still drilling panels for rosette welds, treat yourself to a punch. You'll see that it will be well worth the money, save you time and give you a better final product with no burrs to file.
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infiniteLoop
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PostPosted: Tue Dec 08, 2020 3:00 pm    Post subject: Re: Sheet metal hole punch recommendation Reply with quote

I thought I would post the other two methods because I found that they worked well. They get a perfectly round hole unlike a regular drill bit. I have a pre "Chinese flood the market' Chinese Whitney punch that works perfect.
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ncpi
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PostPosted: Tue Dec 08, 2020 3:14 pm    Post subject: Re: Sheet metal hole punch recommendation Reply with quote

Thanks guys...appreciate your input and the ability to learn from your experiences. I think I'll go with the hand punch.
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misterh
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PostPosted: Thu Dec 10, 2020 6:40 am    Post subject: Re: Sheet metal hole punch recommendation Reply with quote

ncpi wrote:
Thanks guys, looks like the hand punch will work. I probably won't drill even though its the cheapest route as I would rather not clean up all the holes.

I still wonder if the pneumatic punch would work well enough on my tiny compressor. Anyone tried it?


The Harbor Freight flange/punch works for me. It only consumes air for a fraction of a second for each hole.
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ncpi
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PostPosted: Thu Dec 10, 2020 7:12 am    Post subject: Re: Sheet metal hole punch recommendation Reply with quote

misterh wrote:
ncpi wrote:
Thanks guys, looks like the hand punch will work. I probably won't drill even though its the cheapest route as I would rather not clean up all the holes.

I still wonder if the pneumatic punch would work well enough on my tiny compressor. Anyone tried it?


The Harbor Freight flange/punch works for me. It only consumes air for a fraction of a second for each hole.


Thanks! That's exactly what I wanted to know...but....I just pulled the trigger on ordering the hand punch, literally 5 minutes before your post Sad Crying or Very sad
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Bulli Klinik
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PostPosted: Thu Dec 10, 2020 10:04 am    Post subject: Re: Sheet metal hole punch recommendation Reply with quote

Here's the handle extension I use on my punch. You can make quick work of punching holes with the punch in a vice. I welded a flange on the lower handle in order to mount it.
Image may have been reduced in size. Click image to view fullscreen.


In addition to punching holes for rosette welds, I use mine with an 1/8" punch to make these little tabs used to trial fit and align panels prior to welding. Benefit is that you can align the panels with no gap as opposed to the wingnut style panel clamps. Always shoot for no gaps.
Image may have been reduced in size. Click image to view fullscreen.

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ncpi
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PostPosted: Thu Dec 10, 2020 5:52 pm    Post subject: Re: Sheet metal hole punch recommendation Reply with quote

Bulli Klinik wrote:
Here's the handle extension I use on my punch. You can make quick work of punching holes with the punch in a vice. I welded a flange on the lower handle in order to mount it.

In addition to punching holes for rosette welds, I use mine with an 1/8" punch to make these little tabs used to trial fit and align panels prior to welding. Benefit is that you can align the panels with no gap as opposed to the wingnut style panel clamps. Always shoot for no gaps.


Nice welds! I hope I don't need handle extensions that long Surprised I bet the cheap chinese hand punch's die cast handles would snap Laughing
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