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How do you cut CroMo pushrods?
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Topic: How do you cut CroMo pushrods? (Read 7364 times)
j-f
Hero Member
Posts: 1605
Jean-François
How do you cut CroMo pushrods?
«
on:
August 25, 2014, 19:37:19 pm »
I need to cut a set of Cromoly pushrods. Last time I did this work I had them cut by a local machine shop. Cutting them on a lathe is the best way, but it seems that the machine shop is out of business
I wondered if you have some tips to properly cut them.
(I have a lathe for years, but never get the time to make it works and learn how to use it
Maybe it's the right time now
)
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TexasTom
Hero Member
Posts: 1518
12.58@106, 7.89@89 Texas Motorplex 10/18/09
Re: How do you cut CroMo pushrods?
«
Reply #1 on:
August 25, 2014, 20:30:47 pm »
I've cut them many times with just a hacksaw, then detail the length on a belt sander.
TxT
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j-f
Hero Member
Posts: 1605
Jean-François
Re: How do you cut CroMo pushrods?
«
Reply #2 on:
August 25, 2014, 21:34:54 pm »
Quote from: TexasTom on August 25, 2014, 20:30:47 pm
I've cut them many times with just a hacksaw, then detail the length on a belt sander.
TxT
I've think to saw them by hand but I was not sure if it was a good way to do it. I fear to have the pushrod tips not square with the pushrods.
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Martin S.
Hero Member
Posts: 990
Re: How do you cut CroMo pushrods?
«
Reply #3 on:
August 26, 2014, 00:08:18 am »
http://youtu.be/uLEU16tEPDU
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Cal Look white 68 Bug with AJ Sims EFI Turbo 2332. 194hp 240tq @ 5500 rpm 3psi boost.
neil68
Hero Member
Posts: 538
Re: How do you cut CroMo pushrods?
«
Reply #4 on:
August 26, 2014, 05:01:15 am »
Quote from: j-f on August 25, 2014, 21:34:54 pm
Quote from: TexasTom on August 25, 2014, 20:30:47 pm
I've cut them many times with just a hacksaw, then detail the length on a belt sander.
TxT
I've think to saw them by hand but I was not sure if it was a good way to do it. I fear to have the pushrod tips not square with the pushrods.
I take a plumbing pipe cutter and start a cut going around the pushrod...just a small groove. Then I use a hacksaw and it will follow the groove, thus keeping the tips straight. I've cut several sets of Manton chromoly pushrods using my method:)
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Neil
Der Kleiner Rennwagens
'68 Beetle, 2332 cc, 204 WHP
12.5 seconds @ 172 KM/H (107.5 MPH)
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TexasTom
Hero Member
Posts: 1518
12.58@106, 7.89@89 Texas Motorplex 10/18/09
Re: How do you cut CroMo pushrods?
«
Reply #5 on:
August 26, 2014, 11:18:10 am »
I mark the length with a dial caliper.
Then rough-cut them with the saw, but 1-2mm longer than needed.
Using the belt sander, roll the pushrod blanks as you softly feed the material in. Once you get close to the mark, recheck with the dial caliper.
BE CAREFUL not to take too much material at a time!
Relatively easy to get them within .25mm, short to long this way.
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danny gabbard
Hero Member
Posts: 2915
gabfab
Re: How do you cut CroMo pushrods?
«
Reply #6 on:
August 26, 2014, 17:00:15 pm »
If ya know anybody with a lathe , Use a parting tool .
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A poor craftsman, Blame's it on poor tools. GAB-FAB shop # 775 246-3069
deano
Hero Member
Posts: 1851
Re: How do you cut CroMo pushrods?
«
Reply #7 on:
August 26, 2014, 17:04:45 pm »
I read where some use an arrow saw to cut pushrods....
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TexasTom
Hero Member
Posts: 1518
12.58@106, 7.89@89 Texas Motorplex 10/18/09
Re: How do you cut CroMo pushrods?
«
Reply #8 on:
August 26, 2014, 20:34:17 pm »
Like Danny says ... a poor craftsman blames it on poor tools.
There are a number of ways to do it, and just as many to ruin them!
Patience is a virtue ...
TxT
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andy198712
Hero Member
Posts: 1063
Re: How do you cut CroMo pushrods?
«
Reply #9 on:
August 26, 2014, 20:43:29 pm »
I'm in a similar situation, got some fancy alu pushrods and worried i'll ruin £120 of pushrods!
i've read that an arrow cutter is a good method to get a square edge (if a lathe isn't available)
the sander to finish off sounds good especially if it had a guide on it to get a nice right angle cut...
a lot of people use pipe cutters all the way through but i can't help but think this will crimp the end in slightly?
as had been said, many ways to skin a cat!
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BeetleBug
Hero Member
Posts: 2836
Snabba grabben...
Re: How do you cut CroMo pushrods?
«
Reply #10 on:
August 27, 2014, 07:54:39 am »
Quote from: andy198712 on August 26, 2014, 20:43:29 pm
A lot of people use pipe cutters all the way through but i can't help but think this will crimp the end in slightly?
as had been said, many ways to skin a cat!
I have "fancy" alu pushrods in both my engines. They are dual tapered and that makes it a little bit easier to cut with a cheap pipe cutter (due to the angle) Use a little lube and you cut through them really easy. Afterwards I grind the ends to make sure the angle is close to perfect. A quick and easy job.
-BB-
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nicolas
Hero Member
Posts: 4010
Re: How do you cut CroMo pushrods?
«
Reply #11 on:
August 28, 2014, 07:19:16 am »
hey JF just use your lathe. if the length is over a couple of mm just use your tool to cut a piece of, lower RPMs and gentle hand feed. that way you have only a small tip to de-bur and chamfer it just to clean it up to guide the tip you want to hammer in (copper hammer)
i also used a piece in the head to have them all equal (don't know the english word) and it worked perfect as none differ 0,1mm
hope it helps. just use what you have
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andy198712
Hero Member
Posts: 1063
Re: How do you cut CroMo pushrods?
«
Reply #12 on:
August 28, 2014, 11:16:16 am »
Quote from: BeetleBug on August 27, 2014, 07:54:39 am
Quote from: andy198712 on August 26, 2014, 20:43:29 pm
A lot of people use pipe cutters all the way through but i can't help but think this will crimp the end in slightly?
as had been said, many ways to skin a cat!
I have "fancy" alu pushrods in both my engines. They are dual tapered and that makes it a little bit easier to cut with a cheap pipe cutter (due to the angle) Use a little lube and you cut through them really easy. Afterwards I grind the ends to make sure the angle is close to perfect. A quick and easy job.
-BB-
cheers, i've got a little pipe cutter so might give it a whirl, i did a standard one with it to make an adjustable...
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j-f
Hero Member
Posts: 1605
Jean-François
Re: How do you cut CroMo pushrods?
«
Reply #13 on:
August 28, 2014, 21:36:07 pm »
I already tried with a pipe cutter but cromoly is too hard to cut with this tool
The "problem" is solved, the guy at the machine shop simply was on holiday but doesn't put a sign on the window to avoid catching thiefs's attention
Thanks for all the replies guy's
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Martin S.
Hero Member
Posts: 990
Re: How do you cut CroMo pushrods?
«
Reply #14 on:
August 29, 2014, 00:04:58 am »
That's great. I like how my machinist buddy removed a stubborn tip. He added a drop of water and heated the pushrod until the steam inside shot the tip out like a bullet, going clear across the shop!
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Cal Look white 68 Bug with AJ Sims EFI Turbo 2332. 194hp 240tq @ 5500 rpm 3psi boost.
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