Atlas Mill Countershaft And Motor Pulley Replacements- Where Can I Find Them?

OK. I forgot that you were "building" a mill from parts. The Atlas mill had 12 model numbers.

M1, MF, MH (4-groove spindle pulley)
M1A, MFA, MHA (3-groove)
M1B, MFB, MHB (2-groove)
M1C, MFC, MHC (2-groove)

Of these, the MFx is generally the most common and considered the most desirable.

M1x Manual lead screw cross feed, infeed and table height
MFx Powered lead screw cross feed, manual infeed and table height
MHx Lever cross feed and table height, manual screw infeed.

Before you buy any more parts, you really need to get a copy of MMB5 (Milling Machine Bulletin 5), the combined parts list for all 12 models. And determine what model or models you have the most parts for. However, MMB5 has no operating instructions. For that get MMB1A or MMB2 for MxB models or MMB3 or MMB4 for MxC models. Some parts are interchangable between all 12 models down to some parts only apply to one model, and everything in between.

If you wish, since you still have several posts to go to get to 30 and direct access, PM me your email address and I will go ahead and send at least MMB5 and MMB3.

As best I have been able to determine, the 2-groove spindle and cone countershaft pulleys on the MxB and MxC take either a 4L section or an A-section belt (both 1/2"). The MFB and MFC motor belts are 4L350. I was told that one MFC was found with a Gates 3280 but haven't yet learned what it crosses to. The MFB and MFC spindle belts have different Atlas part numbers and I don't know whether this is because the belt length was changed or they switched from 4L FHP type to A Multiple type or something else..
 
I use segment or link belts. They turn corners better and do not require dis-assembly.
 
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There are two schools of thought on link belts. Some like them and some don't.

Compared to V-belts, they have three advantages - you don't have to pull the spindle to change one so they are good for emergency repairs, if you have a lot of machines that use different length V-belts, you don't have to stock more than enough to make up the longest one in order to be able to do an emergency repair, and you don't have to know the original belt length (from the original industry number).

They have several disadvantages - acceptable quality ones are usually more expensive than a good V-belt, they are not rated as reversible, they have a lower torque rating, they are more prone to slippage, and they tend to stretch.in use. If compared to a new rather than to a 70 year old V-belt, they are not normally any quitter.
 
I not sure how to PM you. Very new to this type of media format. I looked at a picture of the base and it looks like it may be a FMC. Thanks Robert
 
The easiest quickest way to send someone a PM from a thread is to click on their user ID (WA5CAB in my case) where it shows up in BOLD at the left end of one of their posts. A small window will pop up. At the bottom is a black bar that if you look closely you will see "Start A Conversation". Click on that. When you have written your message and click Send, you should be returned to the thread. The longer way is to click on INBOX near the top right corner of the screen (you must first scroll up to the top of screen). That will take you to Conversations, which is what vBulletin calls PM's.
 
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