[QUOTE=k gledhill;1138487]The idea of dropping the hand on a bag simply for bone density alone is …well… DVD series ! :D[/QUOTE]
If you read my previous post you will see that IP training encompasses much more than just bone density.
[QUOTE=k gledhill;1138487]We hit with bare hands in VT , wall bags with varying density as we progress. We hit a bag in front of us to develop striking ideas along with hip / elbow ‘pulses’ in a line of force we also use in fighting. [/QUOTE]
In our lineage, the bags are in front, to the sides and on the bottom. There is also the sand bowl, whose purpose is not to teach you how to strike downwards. 
[QUOTE=k gledhill;1138487]If your dropping your arm downwards onto a bag for punching or palm striking work your losing the WHOLE purpose of SLT
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There are some real sifus who would disagree with you on that point.
[QUOTE=k gledhill;1138487]Dont forget that while punching a wall bag your also traveling a certain way to the bag to ingrain an intercepting line from wu sao to the apex etc…so its multi-tasking along with learning to deliver strikes. Many simply see a bag and want to hit it hard with no ideas of alignment, wu-shin…[/QUOTE]
Good point. However, as far as Wing Chun (and other TCMA are concerned) hitting downward exercises such as the bag and the sand bowl, are not practiced in isolation.
[QUOTE=k gledhill;1138487]Any toughening and bone density is a by-product of our bare hand striking objects unprotected for years.
My hands and forearms from dummy work arent ‘normal’
but I didnt say to myself one day " I am going to slap my hand down on a bag to make my hand harder " . [/QUOTE]
But many genuine TCMA masters and grandmasters have done so, but of course, the purpose of this methodology was never about solely to make your “hand harder”.
[QUOTE=k gledhill;1138487]I developed open hand strikes that can stop you cold where you stand and drop, but I never once thought to make my bones denser first . [/QUOTE]
Yes, open hand strikes are effective and their effectiveness is rarely about bone density.
[QUOTE=k gledhill;1138487]Frankly if you hit a skull with a palm you dont need this ‘Iron Palm’ you just need good alignment etc..I have hit guys in fights with my plain ol palm and had good results.[/QUOTE]
That is why the name “Iron Palm”, which refers to the methodology we are talking about is some what misleading.
[QUOTE=k gledhill;1138487]I did develop blisters at the base of my palm and then calluses from palm striking work on a wall bag.
Once you get this alignment and line of force you can take it to a heavy bag and start to use turning force/axis, body mass in motion in time with striking entry, etc…[/QUOTE]
True. That is Wing Chun as practiced generally, but there are TCMA styles that can do great bit of damage with their IRON PALM without using the body mass in motion method.
[QUOTE=k gledhill;1138487]I can also break bricks with my palm. Bricks dont hit back ; )[/QUOTE]
Not after you so mercilessly break them, they don’t! 