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Hafco Metal Master HM-52 CNC Conversion
Firstly, I'd like to say hello to everyone on this awesome forum.
Well here is the start of my CNC conversion of a Hafco Metal Master HM-52 Horozontal and Verticle Knee mill. It is a Tiawaneese machine which I purchased from the importer here in Australia. The machine itself is very similar in design to a Bridgeport machine only heaps cheaper. I have already done many manual jobs with it so far and it has passed every test with flying colours. Here is a photo of the HM-52. It cannot be seen in the photo but the HM-52 has 2 drive motors, one for each INT30 spindle, both are belt drive, automatic feed on the X axis, coolant pump, 1000mm X 240mm Table, 600mm Longitudinal Travel, 180mm Tranverse travel, vert spindle to table is 375mm, spindle stroke 125mm, spindle speeds from 90 to 2400rpm running mains power at 1.5kW. Machine stands 2060mm tall and weighs 800kg.
All slide ways are dove tail's including the ram. The Vertical spindle has a fine feed and can tilt side to side and the ram can swing a full rotation...... oh and the table can also swivel.
For the price of this thing it is amazing just how many configurations it can handle.
More posts to come........
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New Quill Finialy Finished
G'day Guys
Well after two weeks of "A bit here and there" the new quill is done.
It was all pretty straight forward as the photos sudgest, with a few exceptions.
Firstly the dia of the chrome bar was 89.995mm as supplied. This was a almost perfect fit on the bore of my mill head(90.005mm).
However i had a feeling it might expand slightly when i drilled the center out. Which it did by almost 0.03mm!!!:confused: There must have been some residual stresses in the steel which i "releaved" when i drilled it out. This ment some honing of the bore was required to get the fit right, which was done with an automotive cilinder hone in a cordless drill.
Secondly, Hard chrome plated bar is REALLY FRIKIN HARD!!
When i went to cut the rack teeth, HSS hardly left a mark on it let alone cut it! I had to resort to using a few old solid carbide end mills, reground to a "v" shape. One roughing tool ground slightly undersize, held in the collet chuck and used in the conventional way, and another form tool carfully ground to fit the original teeth and held in my boring head. I also marked the teeth positions and using a 4" angle grinder, ground the some of the chrome away in each tooth position. This gave the cutter tip much better life.
The finial result is even better than expected. Due to the top end being about 0.005 larger than the rest (Mostly due to the interference fit of the top bearing) the quill actualy gets slightly tighter as it is lowered, just what i needed!:)
The name if each pic is a shot description.
Cheers
Leeroy