- 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.
![upload_2016-5-31_16-8-37.png upload_2016-5-31_16-8-37.png](https://www.hobby-machinist.com/data/attachments/87/87328-7634fb41fd09ee82ec500bd2199aecb9.jpg)
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.
![upload_2016-5-31_16-9-13.png upload_2016-5-31_16-9-13.png](https://www.hobby-machinist.com/data/attachments/87/87329-2fc74c4d964339148598d20c9fbe4047.jpg)
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.
![upload_2016-5-31_16-10-18.png upload_2016-5-31_16-10-18.png](https://www.hobby-machinist.com/data/attachments/87/87330-3da384c8e6892be50e155664701d46fc.jpg)
The provided arbor tir was .002"
![upload_2016-5-31_16-10-53.png upload_2016-5-31_16-10-53.png](https://www.hobby-machinist.com/data/attachments/87/87331-665d3abb548fe8cc5ab5978839fa78b0.jpg)
With the provided chuck installed the outside of the body measured .003" tir
![upload_2016-5-31_16-11-20.png upload_2016-5-31_16-11-20.png](https://www.hobby-machinist.com/data/attachments/87/87332-e170db4d020126b4f83d62567fd95474.jpg)
A 1/2" dowel chucked up ran out about .006" 1" down from the end of the chuck.
![upload_2016-5-31_16-11-55.png upload_2016-5-31_16-11-55.png](https://www.hobby-machinist.com/data/attachments/87/87333-6d9cfcbbda4f2b7a67d0a566a4465ca1.jpg)
Then I chucked up a length of 3/4" ground drill rod
![upload_2016-5-31_16-12-22.png upload_2016-5-31_16-12-22.png](https://www.hobby-machinist.com/data/attachments/87/87334-38952bc87d07e0ff1178608d68623eb0.jpg)
I zeroed out the indicator and plunged the quill it's full travel and read a little over .005" deviation front to back
![upload_2016-5-31_16-12-59.png upload_2016-5-31_16-12-59.png](https://www.hobby-machinist.com/data/attachments/87/87335-8f306e329a631cd508a76a0a3558cc67.jpg)
And again about .005 sided to side
![upload_2016-5-31_16-13-31.png upload_2016-5-31_16-13-31.png](https://www.hobby-machinist.com/data/attachments/87/87336-300283f2446a2fd49a0973db977f72ba.jpg)
At full extension I zeroed the indicator and again rotated by hand. I measured .01" TIR at nearly 10" from the chuck.
![upload_2016-5-31_16-13-56.png upload_2016-5-31_16-13-56.png](https://www.hobby-machinist.com/data/attachments/87/87337-8b3f051e1bd75ea3801c993160d8dd05.jpg)
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:
![upload_2016-5-31_16-14-36.png upload_2016-5-31_16-14-36.png](https://www.hobby-machinist.com/data/attachments/87/87338-5ec1aada6ac39ff8e5bbcba1d33636d2.jpg)
and side to side
![upload_2016-5-31_16-15-0.png upload_2016-5-31_16-15-0.png](https://www.hobby-machinist.com/data/attachments/87/87339-b6c1d3584f9cceb8630ef31228703498.jpg)
So that's the conclusion of the technical section. Next up, fit and finish.
![upload_2016-5-31_16-8-37.png upload_2016-5-31_16-8-37.png](https://www.hobby-machinist.com/data/attachments/87/87328-7634fb41fd09ee82ec500bd2199aecb9.jpg)
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.
![upload_2016-5-31_16-9-13.png upload_2016-5-31_16-9-13.png](https://www.hobby-machinist.com/data/attachments/87/87329-2fc74c4d964339148598d20c9fbe4047.jpg)
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.
![upload_2016-5-31_16-10-18.png upload_2016-5-31_16-10-18.png](https://www.hobby-machinist.com/data/attachments/87/87330-3da384c8e6892be50e155664701d46fc.jpg)
The provided arbor tir was .002"
![upload_2016-5-31_16-10-53.png upload_2016-5-31_16-10-53.png](https://www.hobby-machinist.com/data/attachments/87/87331-665d3abb548fe8cc5ab5978839fa78b0.jpg)
With the provided chuck installed the outside of the body measured .003" tir
![upload_2016-5-31_16-11-20.png upload_2016-5-31_16-11-20.png](https://www.hobby-machinist.com/data/attachments/87/87332-e170db4d020126b4f83d62567fd95474.jpg)
A 1/2" dowel chucked up ran out about .006" 1" down from the end of the chuck.
![upload_2016-5-31_16-11-55.png upload_2016-5-31_16-11-55.png](https://www.hobby-machinist.com/data/attachments/87/87333-6d9cfcbbda4f2b7a67d0a566a4465ca1.jpg)
Then I chucked up a length of 3/4" ground drill rod
![upload_2016-5-31_16-12-22.png upload_2016-5-31_16-12-22.png](https://www.hobby-machinist.com/data/attachments/87/87334-38952bc87d07e0ff1178608d68623eb0.jpg)
I zeroed out the indicator and plunged the quill it's full travel and read a little over .005" deviation front to back
![upload_2016-5-31_16-12-59.png upload_2016-5-31_16-12-59.png](https://www.hobby-machinist.com/data/attachments/87/87335-8f306e329a631cd508a76a0a3558cc67.jpg)
And again about .005 sided to side
![upload_2016-5-31_16-13-31.png upload_2016-5-31_16-13-31.png](https://www.hobby-machinist.com/data/attachments/87/87336-300283f2446a2fd49a0973db977f72ba.jpg)
At full extension I zeroed the indicator and again rotated by hand. I measured .01" TIR at nearly 10" from the chuck.
![upload_2016-5-31_16-13-56.png upload_2016-5-31_16-13-56.png](https://www.hobby-machinist.com/data/attachments/87/87337-8b3f051e1bd75ea3801c993160d8dd05.jpg)
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:
![upload_2016-5-31_16-14-36.png upload_2016-5-31_16-14-36.png](https://www.hobby-machinist.com/data/attachments/87/87338-5ec1aada6ac39ff8e5bbcba1d33636d2.jpg)
and side to side
![upload_2016-5-31_16-15-0.png upload_2016-5-31_16-15-0.png](https://www.hobby-machinist.com/data/attachments/87/87339-b6c1d3584f9cceb8630ef31228703498.jpg)
So that's the conclusion of the technical section. Next up, fit and finish.
Last edited: