Post driver

happylad · 15-09-2019 08:20AM #1

Hi everybody,

Just looking at making a post driver guys. I have all the bits here but just wondering how the ram is piped. Looking at other drivers the hammer ram is only piped to retract the cylinder. Is that correct. Can I just blank the top port or does it need a bit of a pipe of it like the attached. Not sure what this pipe does as no oil should be at this end if it's not piped.

Thanks in advance for the help

B Rabbit · 15-09-2019 08:31AM

happylad wrote: »

Hi everybody,

Just looking at making a post driver guys. I have all the bits here but just wondering how the ram is piped. Looking at other drivers the hammer ram is only piped to retract the cylinder. Is that correct. Can I just blank the top port or does it need a bit of a pipe of it like the attached. Not sure what this pipe does as no oil should be at this end if it's not piped.

Thanks in advance for the help

I'm no expert but if there's no oil that side, there'll be air. The air has to get out somehow?

This maybe completely wrong!

Snowfire · 15-09-2019 08:33AM

happylad wrote: »

Hi everybody,

Just looking at making a post driver guys. I have all the bits here but just wondering how the ram is piped. Looking at other drivers the hammer ram is only piped to retract the cylinder. Is that correct. Can I just blank the top port or does it need a bit of a pipe of it like the attached. Not sure what this pipe does as no oil should be at this end if it's not piped.

Thanks in advance for the help

Is it not to release air, mine has something similar, but I never see oil coming from it, tho the way it’s piped would suggest its for oil alright

happylad · 15-09-2019 08:39AM

Thanks for the reply guys. Yes air release would make sence

valtra2 · 15-09-2019 09:02AM

Yes for air plus they might be a small amount of oil as the seal wears

patsy_mccabe · 15-09-2019 09:19AM

happylad wrote: »

Hi everybody,

Just looking at making a post driver guys. I have all the bits here but just wondering how the ram is piped. Looking at other drivers the hammer ram is only piped to retract the cylinder. Is that correct. Can I just blank the top port or does it need a bit of a pipe of it like the attached. Not sure what this pipe does as no oil should be at this end if it's not piped.

Thanks in advance for the help

That port is to let out the small bit of oil that leaks past the seal on the cylinder rod. It is mostly air that comes in and out there as the rod moves up and down. As the seal wears, more and more oil will come out here. A good idea whoever came up with it. Might aswell put the oil to good use to lubricate the moving parts.

What did you use to make up the weight?

happylad · 15-09-2019 10:05AM

I work in an engineering workshop so I have had my name on the punchings out of the machine and bits like that. I made the bottom and top out of a 20mm plate so hopefully should be good enough.

Attie Ross · 15-09-2019 06:06PM

patsy_mccabe wrote: »

What did you use to make up the weight?

Led shot.

patsy_mccabe · 15-09-2019 06:26PM

happylad wrote: »

I work in an engineering workshop so I have had my name on the punchings out of the machine and bits like that. I made the bottom and top out of a 20mm plate so hopefully should be good enough.

I've heard that some lads pour in some dry sand to fill in the spaces around teh bits of metal. Takes the noise out of it.

Attie Ross wrote: »

Led shot.

This is what the manufacturers use.

hopeso · 15-09-2019 08:32PM

happylad wrote: »

Hi everybody,

Just looking at making a post driver guys. I have all the bits here but just wondering how the ram is piped. Looking at other drivers the hammer ram is only piped to retract the cylinder. Is that correct. Can I just blank the top port or does it need a bit of a pipe of it like the attached. Not sure what this pipe does as no oil should be at this end if it's not piped.

Thanks in advance for the help

Yes, the oil is piped into the retract side of the cylinder, simply because that side of the cylinder takes a lot less oil to fill, so it will empty faster when you release the oil, allowing the hammer to fall faster. The pipe on the top just drains away any oil that might get past the seal, as already said. Another thing to make sure of is that you have a fairly wide diameter hydraulic pipe going to the ram. Again, this is to let the oil back faster.....

happylad · 15-09-2019 09:01PM

I put sand in around the punchings and I stitched a 10mm plate to break the height of weight up 3 times. Prob overkill but I pressed in down and stitched it around it. I done this 2 times up the height of the weight. I was afraid the loose punching would start rattling around inside. I put a 20mm cap plate top and bottom.

Hopefully it works &#55358;&#56606;&#55358;&#56606;

Cavanjack · 15-09-2019 09:11PM

happylad wrote: »

I put sand in around the punchings and I stitched a 10mm plate to break the height of weight up 3 times. Prob overkill but I pressed in down and stitched it around it. I done this 2 times up the height of the weight. I was afraid the loose punching would start rattling around inside. I put a 20mm cap plate top and bottom.

Hopefully it works ��

Don’t be afraid to post a picture

Post driver

Comments