Hybrid Car – More Fun with Less Gas

Charging NiMH battery pack - Page 3

register ::  Login Password  :: Lost Password?
Posted by Jim Wilkins on June 19, 2021, 9:48 pm
 


...Some years ago I introduced him to my new to me linisher and he
found it so useful he kept popping round to use it, in the end he bought
his own and got it at a good price I guess as the auction finished
Sunday lunchtime when the football was on.

-----------------------

After I ordered some 1/2" x 12" sanding belts for an auto body air sander I  
began seeing ads for the same size belts in very fine grits for a sharpener.  
I also have a 1" x 30" belt sander with some unsupported space above the  
platen that I use for freehand deburring. Do these sound like good  
candidates for "linishing"?

The blacksmith/knife maker whose class I took had a large and powerful  
shop-made 3 wheel belt sander for shaping blades. I tried it, but I'm  
experienced enough with a 7" angle grinder to remove metal as fast and  
reasonably neatly, with the work in a vise so it doesn't burn my hand.


Posted by David Billington on June 19, 2021, 10:34 pm
 
On 19/06/2021 22:48, Jim Wilkins wrote:

Sounds like we have some of the same kit, I too have a 1/2" x 12"(12mm x  
300mm) air belt sander and the linisher, maybe you'd call it a vertical  
belt sander, sounds much the same though is 25mm x 1065mm (1" x 42").  
The bit above the platen does get the most use, the platen not so much.  
I refurbish glass blowing jacks occasionally and reshape the parts built  
up freehand with an angle grinder, one can do surprisingly fine work  
with care and the right choice of discs.


Posted by Jim Wilkins on June 20, 2021, 1:32 am
 
...
I refurbish glass blowing jacks occasionally and reshape the parts built
up freehand with an angle grinder, one can do surprisingly fine work
with care and the right choice of discs.

------------------------

I bought a batch of name brand saucer disks for my 7" angle grinder cheap,  
then found that they were rejects whose hubs hadn't been staked securely  
enough, so I machined a hub that screws tight to salvage them. Lathe time is  
good time when making metal take whatever shape I imagine. The saucer shape  
is nice for grinding welds flat because it continues to cut only at the  
outer rim as it wears down, and thus guides itself to make a flat surface.


Posted by Jim Wilkins on June 20, 2021, 2:01 am
 
Sounds like we have some of the same kit, I too have a 1/2" x 12"(12mm x
300mm) air belt sander and the linisher, maybe you'd call it a vertical
belt sander, sounds much the same though is 25mm x 1065mm (1" x 42").
The bit above the platen does get the most use, the platen not so much.

--------------------

My Delta 1" x 30" belt sander is a light-duty hobby machine whose main  
virtue is that it's compact and light enough to occupy shelf instead of  
bench space when not in use. I think yours is the better choice if there's  
serious work to do.


Posted by Jim Wilkins on June 19, 2021, 9:13 pm
 
I worked out the peak current by measuring the motor resistance and
selected suitable new cells from a vendor which could supply them with
tabs already welded on. With the cost of the cells and a few other bits
it might have been better to buy a new drill as it might not have been
much more expensive but it was interesting to do it. I've only done the
one pack at the moment but have all the bits ready to do the 2nd just
need to get the soldering iron out.

---------------------------

After wiring the battery connection adapter I measured the fully On  
resistance as 4.8 Ohms, likely that high because it has an electronic  
variable speed control. Restraining the chuck with my hand as best I could,  
the 20A power supply current-limited and dropped to 4V, and a (very) quick  
check on the last half-decent NiCad peaked at 35A.

The drill has plenty of torque on a 12V lead-acid which may be how I power  
it to raise the head of my sawmill between logs.  


This Thread
Bookmark this thread:
 
 
 
 
 
 
  •  
  • Subject
  • Author
  • Date
please rate this thread