Do You Need New Mini Mill Way Covers? Here's a Very Cost Effective Solution

I have a Harbor Freight 44991 mini mill that I bought it in 2006 if I recall right – it’s been so long that I don’t actually remember at this point. It’s served me well but like anything, stuff happens with age. In this case, the mini mill way covers were breaking down due to oxidation and repeated flexing.

I’ve replaced the way covers a few times over the years but this time had a challenge finding any in stock. In general, my goto spot for mini mill parts is LittleMachineShop.com and I recommend them to anyone with a mini mill or lathe. They’ve been out of stock for a while now and I wanted a solution sooner instead of later. I was adjusting my mill, cleaning it up in general and wanted to get the covers on so the ways would stay clean.

If you are new to machining, way covers aren’t just cosmetic. They keep debris off the ways (the machined surfaces that move on the X-Y table). If you don’t keep the ways clean you run the risk of something getting under the table and throwing it off or even just making cranking the handles harder.

So, I needed to find another source but where? I had to figure out an alternative. Way covers have a diameter and length – how hard can it be if I searched using the measures and adapted whatever I found? The answer is that making your own is surprisingly easy. The way covers for the 44991 mini mill, and the two dozen or so brands that are actually the same machine made by Sieg in Shanghai, are 200mm wide and that’s the key – looking for millimeters vs. inches.

My initial mistake was to try and find a cover with a width between 7.75 and 8 inches. Then it dawned on me that the machine’s parts are actually metric and the width was 200mm. I figured if I could find a long enough length I would just cut it down and that strategy worked. By the way, that’s a 12″ IGaging Absolute Origin caliper. It’s a rare job where I need to measure something bigger than my 6″ Mitutoyo caliper can handle. For those rare occasions, the IGaging caliper has been good enough for me.

Armed with that, I immediately found way covers on Amazon. They are really long but you can cut them down with a plain sharp knife and straight edge no problem. Click here for the listing. At the time of purchase, they had one review. I was in a rush and figured I would gamble $10.19 not including a 5% off coupon. It was shipped from China and took about two weeks to arrive.

Guess what? They are actually really decent. Instead of rubber, these way covers are some kind of rubberised fabric. I’m not even sure rubber is the correct term and cutting them down to fit is fast and easy with plenty left over for a few more replacements (I stored the remainder in a heavy ziploc industrial bag and actually purged it with nitrogen. Yeah, I work with plastics so I have access to that stuff. Just sealing it in a good ziploc-type bag and keeping it safe would probably work too.

Let’s Step Through The Process

I did my covers one at a time starting with the front. The cover is held in place by a bracket on each end. Each bracket is held in place by two Phillips round head screws. Remove the brackets and the covers. Note the front cover has two sizes of screws when you go to reassemble it.

Each way cover is held in place by a metal strip and two Phillips round head metric screws. Note, on the front way the front and back screws are two different sizes so pay attention what goes where (the larger diameter screws are to the back if I recall correctly). This is either my second or third set of rubber way covers. They slowly break down with time and use.

With the cover off, I cleaned and lubed the ways and also the threaded rod. I then moved on to make the cover.

I removed the front cover and took the time to clean and lube the ways and threaded rod.

The old way cover is to the right. The 200mm x 1500mm new way cover is to the left. It turns out the folds are 1.5cm on both so I just counted the peaks and made my cut. If the fold height didn’t match then I would have fit it based on the smoothed out length.

I cut the length of new cover I needed and then used the old brackets to mark the hole locations.

I marked the holes and then used a revolving hole punch plier to approximate the openings. I actually own a hole punch set but I don’t know where I put it – that would have been more elegant than my nibbling around the circle with the pliers but I got the job done.

I then did the same for the back and installed the way covers on the mini mill. The next time I do them, I may glue a plastic strip on each end to make it a tad more secure at each end but what I have is working great.

Looks much, much better and the ways are once again protected. It’s a tad floppy at the ends and next time I will add either a small steel or plastic strip the full width of the cover, scuff both sides for a good grip and join them with Starbond black super glue. The cover is perfectly serviceable as-is for now but am keeping that in mind for the future. By the way, that is a Dayton CNC 12″ workholding plate. I have two of them and they’re great. Here’s the link and the wait time is about 2-4 weeks. The positioning strips are from a vendor called Bulk Man 3D on AliExpress. All the holes and fasteners are 1/4-20 and the metric strips can accomodate 1/4-20 socket head screws in case you are wondering.

I’m not sure what this material is but have a suspicion it will hold up better than the rubber. Time, use and exposure to lubricants will tell though. I’ve only had them on for over a week but cutting oil and penetrating oil don’t appear to have affected the material thus far.

Summary

The new way covers are working great. You can make your own and have plenty left over for the next time plus it is cheaper regardless. I have no problem recommending you buy this way cover and cut it to fit. I do suspect it will hold up better than rubber given it is fabric reinforced and not just plain rubber and we’ll see if that proves to be true.

I hope this helps you out.

Note, I have to buy all of my parts – nothing here was paid for by sponsors, etc. I do make a small amount if you click on an ad and buy something but that is it. You’re getting my real opinion on stuff.

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