- Joined
- Jul 23, 2014
- Messages
- 347
More of a overview than review of the Central Machinery 20" Production drill press. #39955 and #61484. Luckily I got a 61484 as it has a MT4 spindle instead of MT3 on the 39955. Same as my lathe tailstock.
It's good to have a friend to help lift the heavy pieces.
The head is split to permit adjusting the quill. Cover does not have to be removed to do this, I just wanted to see what it looked like.
I popped the arbor out and removed the belts. I did not get even .001" of movement through a full rotation by hand of the spindle.
The provided arbor tir was .002"
With the provided chuck installed the outside of the body measured .003" tir
A 1/2" dowel chucked up ran out about .006" 1" down from the end of the chuck.
Then I chucked up a length of 3/4" ground drill rod
I zeroed out the indicator and plunged the quill it's full travel and read a little over .005" deviation front to back
And again about .005 sided to side
At full extension I zeroed the indicator and again rotated by hand. I measured .01" TIR at nearly 10" from the chuck.
I forgot to check the table to spindle while I had the drill rod in and just grabbed a chunk of 5/8 1018 crs and a Starrett 6" square.
Front to back:
and side to side
So that's the conclusion of the technical section. Next up, fit and finish.
It's good to have a friend to help lift the heavy pieces.
The head is split to permit adjusting the quill. Cover does not have to be removed to do this, I just wanted to see what it looked like.
I popped the arbor out and removed the belts. I did not get even .001" of movement through a full rotation by hand of the spindle.
The provided arbor tir was .002"
With the provided chuck installed the outside of the body measured .003" tir
A 1/2" dowel chucked up ran out about .006" 1" down from the end of the chuck.
Then I chucked up a length of 3/4" ground drill rod
I zeroed out the indicator and plunged the quill it's full travel and read a little over .005" deviation front to back
And again about .005 sided to side
At full extension I zeroed the indicator and again rotated by hand. I measured .01" TIR at nearly 10" from the chuck.
I forgot to check the table to spindle while I had the drill rod in and just grabbed a chunk of 5/8 1018 crs and a Starrett 6" square.
Front to back:
and side to side
So that's the conclusion of the technical section. Next up, fit and finish.
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