2013 POTD Thread Archive

[Uglydog]

I'm taking my first Machine Tools class.
It's entry level.
My goal is to tighten up my accuracy.

My first project after an intro to metrology is draw filing a 4x4x.5 inch plate to .001+/-.
Spent about 14 hours now she is .006 under 4x4.
But, she's square and a .001 feeler gage will not fit in any direction between the plate and my straight edges.

Daryl
MN

 

[GK1918]

stAY TUNEN' D I'LL show ya --------------------------- dro

 

[clevinski]

I'm taking my first Machine Tools class.
It's entry level.
My goal is to tighten up my accuracy.

My first project after an intro to metrology is draw filing a 4x4x.5 inch plate to .001+/-.
Spent about 14 hours now she is .006 under 4x4.
But, she's square and a .001 feeler gage will not fit in any direction between the plate and my straight edges.

Daryl
MN

14 hours!?!?! "jawdrop:

God bless you, man... I had to do a project involving filing a 3/4 inch square hole for a tight fit a few months ago, and spent almost 3 hours getting it to fit right. I cannot imagine 14 hours... now that's a dedicated machinist!
:man:

 

[ScottA]

This is a knee riser I made for my field target air rifle. It's almost finished. It's three parts. The top part has a pocket you can't see where an aluminum block rides, it slides into the accessory rail on the rifle. The middle part is aluminum bar, and the bottom is black Delrin that has a rough concave surface machined in the bottom to rest on my knee. Used a Taig mill and my South Bend 10k to make it.


View attachment 60646

 

[GK1918]

The only bad thing about old machinery is that it is hard to mount a DRO of any kind on them. I needed one for my spindle for a project I'm going to start some time next week. So this is what I came up with this is the only place to mount one.
View attachment 60642
Not pretty but it works ok.
View attachment 60643

Paauull

The solution:: Epoxie ! Just no way to drill & tap, the feed motor is in the way so I epoxied it used a bolt again'st the X gear box as a C clamp
left over nite. I'll tell ya cant beat the price and its right on with my dials. Next will be the X on the back side.

 

[bollie7]

14 hours!?!?! "jawdrop:

God bless you, man... I had to do a project involving filing a 3/4 inch square hole for a tight fit a few months ago, and spent almost 3 hours getting it to fit right. I cannot imagine 14 hours... now that's a dedicated machinist!
:man:

When I started my apprenticeship way back in Dec 1974 we spent 6 weeks (40 hour weeks) learning to file, mark out and hacksaw. We got to be pretty good at filing.
Now I'd be going to file a flat surface if my life depended on it.

bollie7

 

[w6br]

Hi All,

I have a HF 16" Heavy Duty Drill Press that needed attention, sounded rather raspy. I picked this Drill Press about 2 years ago used at a very good price, $75.00, so I figured it had been well used since it came with a coolant reservoir (hint, hint). I tore it apart, and sure enough all the grease was hardened and the bearings were sloppy, especially the spindle bearing. No wonder I couldn't keep a concentric center point!!

went to my local Bearing House, purchased all of the replacement Bearings, and to my surprise they had them all - good so far!! Well after tearing everything apart, and thoroughly, and I mean thoroughly cleaning everything, whew, that old grease was something else, but with judicial usage of Acetone, everything came out spotless, Then re-assembly went smooth as can be and the Drill Press sounds just like new. OBTW - I also replaced the pulley V-belts, boy were they hard.

I thought why not, and ordered a new 5/8th no-key Drill Chuck to top it off, and so far I am as happy as a bug in the rug!!

Just my two cents worth - BTW - on my avatar, a couple of the Boys asked me what that represented - well, I was a F-105G Wild Weasel Driver in Nam, and that is the plane that I flew. That was an experience I'll never forget!!

Ron

BTW - I am proud and honored to be a member of this group. You are all just great and helpful!! )

 

[xman_charl]

Replaced saw hole cover plate, on Wilton 14" band saw.

Charl

 

[DAN_IN_MN]

Corrected a buying error that happened over 50 years ago.

My dad did furniture upholstery. When he bought his sewing machine, he ordered the largest/fastest motor he could get which is around 3500+ RPMs. The machine was way too fast and my dad did fit a larger driven pulley years ago. Original pulley on the left.



I still find it too fast as the clutch still has to be feathered, so this is my solution. Found this very ugly but usable pulley in my stuff. Had to modify the hub. A bolt lost it's identity in the process. I'll clean it up and paint it if I like how this turns out. Not seen are two 1/4-20 set screws drilled in the hex head to hold it on the shaft.


With this view, you can see the amount the hub had to be changed to fit the machines shaft. The original hub had small splines and I just pressed the bushing in.


Belt redirect roller added. Those used timing belt tensioners do come in handy. The belt would rub on the slot in the table without this added roller as you can see in the second pic. The mounting bracket for it was from a lawn mower muffler mount. Cut, drill, and tap and it was done.


Now to find the correct belt length and get a new one.

*****EDIT*****

I went to an online belt calculator and it looks like I'll be needed a 47" belt. Along with finding the belt length, I found an RPM calculator.

Here are the difference in RPMs with the pulley changes.

Driver pulley 1.5" with

OEM pulley of 3" = 1456 rpm

Pulley dad put on 5" = 875 rpm

Pulley I added 7.25" = 602 rpm

I might be able to control this beast now.

 

[Goat Driver]

Corrected a buying error that happened over 50 years ago.

My dad did furniture upholstery. When he bought his sewing machine, he ordered the largest/fastest motor he could get which is around 3500+ RPMs. The machine has been way too fast and my dad did fit a larger driven pulley years ago. Original pulley on the left.

I still find it too fast as the clutch still has to be feathered, so this is my solution. Found this very ugly but usable pulley in my stuff. Had to modify the hub. A bolt lost it's identity in the process. I'll clean it up and paint it if I like how this turns out. Not seen are two 1/4-20 set screws drilled in the hex head to hold it on the shaft.

With this view, you can see the amount the hub had to be changed to fit the machines shaft. The original hub had small splines and I just pressed the bushing in.

Belt redirect roller added. Those used timing belt tensioners do come in handy. The belt would rub on the slot in the table without this added roller as you can see in the second pic. The mounting bracket for it was from a lawn mower muffler mount. Cut, drill, and tap and it was done.

Now to find the correct belt length and get a new one.

Nice work! Good to see folks "making do" with what they have in this "throw away" generation. :goodjob: