3 pint linkage post driver

masseyman86

has anyone made a post driver? and could u tell me how you got the weight in the hammer to be 360kg was looking a solied bar around 12'' round and 1.5ft long but that was coming in at 196kg any help would be nice

foxy farmer

masseyman86 wrote: »

has anyone made a post driver? and could u tell me how you got the weight in the hammer to be 360kg was looking a solied bar around 12'' round and 1.5ft long but that was coming in at 196kg any help would be nice

Have you weighed it?
Using your figures and assuming the bar is steel it should weigh close to 250kgs. Vol of cylinder is 0.032cu.m x 7.8(weight of cu.m of steel )
I have a post driver in the making here with a square hammer hoping to weigh well over 350kg. Filled with waste punchings from engineering firm. 0.33mx0.33mx0.45mh

onyerbikepat

It's something that has been at the back of my mind for a while now. I had about 20 stakes to drive last year and could have doen with it then. Most years though I might only drive less than 10. For these the land held one I made does fine.
I was thinking of making one that would double up as a log splitter aswell. Haven't figured that out yet.:D
If you want to work out the weight of a lump of steel, the density is 7.87 g/cc, so work out volume first in cc and then multiply by 7.87.

Cylinder of steel
Density = 7.87g/cc
Dia of Steel = D in cm
Height of steel = H in cm
Volume = pi()*D*D*H/4 where , pi() = 3.142
Weight = Volume *7.87gr

joejobrien

As far as I know the one that I have ..KENTEC has lead balls in the hammer

foxy farmer

Some firms in the early days filled the hammer with lead allowing them to build a smaller size of hammer but when in use the lead compacted inside the hammer swelling and eventually bursting the base. Some are filled with cast iron.

td5man

foxy farmer wrote: »

Some firms in the early days filled the hammer with lead allowing them to build a smaller size of hammer but when in use the lead compacted inside the hammer swelling and eventually bursting the base. Some are filled with cast iron.

Filled the one here with cast.

Nekarsulm

12 inch steel pipe; 30 inches long, base of 1 inch steel, plus another layer of same. 9x6 RSJ welded to base and level with top. Loop of 1.5 bar welded to rsj. Fill with concrete and weld on a "lid" made from same 1 inch plate. Loop protruding through top plate/lid.
Should be plenty.
350 kg is a serious lump of steel at the top of a raised mast. Don't try moving about with it raised.

foxy farmer

Using a short stroke ram and pulley system to raise the hammer. Mine eventually will look like this. Protech 230s. Clip on you tube.

masseyman86

thanks for all the input on this. foxy farmer are you making the hammer out of plates of steel? if yes bigger than 10mm? and when fill it will you be poring in lead to take up the play of the steel inside?

foxy farmer

masseyman86 wrote: »

thanks for all the input on this. foxy farmer are you making the hammer out of plates of steel? if yes bigger than 10mm? and when fill it will you be poring in lead to take up the play of the steel inside?

Have box made out of 8mm plate double layer on bottom welded inside and out. Reinforcing across opposite sides. Was going to cut a thick plate into squares and fill the box that way but expensive. Would cost 250at least. Local company making screens and would have all sizes of punchings as waste. Wouldnt bother with lead.

davidk1394

A local fella made our post driver.we made a few modifications. Put in a heavier H iron in the center, you can remove the legs when you attach it to the tractor. Its nothing special but does the job

Count Mondego

davidk1394 wrote: »

A local fella made our post driver.we made a few modifications. Put in a heavier H iron in the center, you can remove the legs when you attach it to the tractor. Its nothing special but does the job

How much did it cost?

davidk1394

Count Mondego wrote: »

How much did it cost?

I dont honestly know. We have it years