Drill/Mill or Lathe/Mill attachment for small shop area

[Dick Linn]

There's some info here about the mini lathes and mills. http://www.mini-lathe.com/

For an inexpensive lathe, I prefer the 8 x 12 (or 8 x 14), rather than the 7 x 12. More info here: http://www.fignoggle.com/machines/8x12lathe/index.htm

He also has info on some of the mills - X2 & X3. For drilling and light milling, they would do nicely.

Do look around locally for used American iron. I got a Wells-Index mill recently for $950. It needs a few hundred in parts and a 3-phase converter, but is in very nice shape for a 1969 machine. However, it is large and weighs about 2,100 pounds.

I also saw a little Craftsman or Atlas lathe the other day, offered for $25. But with three lathes already, I passed.

[sanddrag]

Originally Posted by Dick Linn

For an inexpensive lathe, I prefer the 8 x 12 (or 8 x 14), rather than the 7 x 12. More info here: http://www.fignoggle.com/machines/8x12lathe/index.htm

Same here. I have this lathe at home. HF often runs 20% off coupons to take a nice chunk off the price. For what it costs, I find it to be adequate for all my lathe work needs, and the quality to be pretty decent, given its origin. I think a majority of the lathe parts a typical FRC team makes would be do-able on this machine. Having this machine is certainly a large improvement over none at all.

I also have an X1 mill with the extended X and Y axes (more travel and larger table than the X2), and converted to CNC. The quality on this machine is not as high as on the 8x12 lathe, but it can still turn out some nice smaller parts in delrin and aluminum once dialed in. You just have to learn to work within its limitations. What's interesting is that by CNCing a small machine (even on the cheap, DIY) you really get a lot more capability. You can drill several holes very accurately, the same every time, in 20 parts, faster than marking it out and doing it on a drill press. You can mill larger holes for bearings, at center-to-center tolerances adequate for gearboxes. You can take several passes at lighter cuts (as required on a small machine) to do a thicker part. You can do nice shaped contours, and lightening pockets. Just don't really expect to do much cutting in any steel on a small machine.

A step up from a small tabletop/benchtop mill would be something either like this or like this. 968 has one similar to this and while it has decent size and power, moving the head on the round column is a major pain. A square column or knee mill is a much better choice.

Does your team have a good miter saw and blade? I think that's essential to an FRC team.

[Dick Linn]

Sanddrag,

I knew you had that lathe. I read your opinion before I bought one

Now I just need to get a 3-phase converter and get our Clausing 12 x 24 hooked up. I picked up a little Craftsman locally for $100. and it needs some cleanup and checkout. Not sure the back gear is quite right.

[DonRotolo]

If it's the aforementioned Atlas 618, let me know your questions, I've gotten pretty deep into mine.

[Cory]

Don't buy a round column mill/drill. They're not a good value for your money.

Our trailer has a Rong Fu RF-45, which sells for ~$2800 and is the best quality mill/drill I've used/seen. It's made in Taiwan, rather than China, which generally means higher quality. It just feels better constructed than most others. We have this machine in our NASA trailer that supports many regional events and it's never had any problems.

On the other hand, for $2800 you may be able to find a decent quality Bridgeport Series I that may need only minor work and cleanup, which would be a vastly superior machine.

[Lowfategg]

One thing I would like to point out is the following,

Teams build all sorts of different robots with a very wide variety of tooling levels. Different teams have different needs depending on the way they both design and build their robots. Some teams are very happy with a bandsaw and a drill press, while others would die without their CNC Mill. There is no problem with this and both styles of teams can build highly competitive robots. But do be noted that this year I found that the size of work you might be working on greatly depends on robot design, the game, and also even projects that are completely non-robot related. As such you should plan ahead to some of the things you might be doing on your machines that you might have never thought of when you buy them.

For setting up our shop this year, we collected the following. Our whole robot lab is in a two car garage, which we do everything in.

Large bench drill press 1/2" chuck (One of the most used tools in our shop.)

“Bridgeport” knee mill 9x32" w/DRO (During the build season this was the most used tool in the shop, but if I could buy one again I would get the larger 42" table. You can get them cheap if you look hard enough, we grabbed ours for $500. They might be big, but worth their weight in gold compared to benchtop mills.)

“Southbend” lathe 10x24" (Probably the third most used tool in our shop, its really hard to do lathe work on anything else but a lathe. I would highly recommend getting one somewhere from 9-11" swing, but once again this depends on the type of work you are planning on.)

6x4" horizontal bandsaw (Plain and simple, every job starts off on this machine. It cuts stock and makes quick work of cutting off just about anything that will fit in its somewhat low capacity, but still a perfect fit in any FRC teams build space.)

Bench grinder and sander w/disc (Could not go without either of them. Used for not only sanding but also: deburring, sharpening lathe bits, and more.)

MIG 140a Welder w/spool gun (If you want to weld a MIG welder with a spool gun and pure argon gas is a good way to go.)

3 ton arbor press (used for broaching, pushing off Fisherprice pinion gears, and other things.)

Other tools include: miter saw, table saw, small vertical bandsaw, small drill press.

That is what worked for us this year. Also remember for both the mill and the lathe there is a lot of extra tooling you will need to buy in order to make it worth your while even using them. Along with that you should properly train your team members to use these tools correctly and safely.

[Chexposito]

they make drill inserts for mills, try to find an engineering company they will eventually get rid of one. We've got 2 (one's on the way) because the companies will buy newer and nicer ones and have no need for the good ones they replaced. Laths aren't absolutely necessary, but if you need one, they make pretty good small ones. and you might be able to do the same thing with older lathes.

Which you get depends on your uses of it. We have a 35 year vetran of using the mill to help us. He has also gotten access to the big engineering firm that donated our space to us. We have only used a good sized lathe once, the rest we could handle on a mini lathe.

[Dick Linn]

If you have a local community college that has a machining curriculum, you might want to get in touch. Our local college helped Team 975 with some machining a few years back. Free resources can't be beat.

[ChuckDickerson]

Originally Posted by Lowfategg

For setting up our shop this year, we collected the following. Our whole robot lab is in a two car garage, which we do everything in.

I'm assuming you are referring to a typical residential two car garage here?

Originally Posted by Lowfategg

“Bridgeport” knee mill 9x32" w/DRO (During the build season this was the most used tool in the shop, but if I could buy one again I would get the larger 42" table. You can get them cheap if you look hard enough, we grabbed ours for $500. They might be big, but worth their weight in gold compared to benchtop mills.)

Ok, I have heard similar stories from countless others over the years and I know they exist out there but I have just never been able to luck up on one of these $500 Bridgeport mill deals to save my life. I have been looking high and low for years but we just don't live in an area with a lot of manufacturing so these deals just don't seem to happen around here.

How does one get and move something like this to a home garage? I don't know of many homes with a forklift so just in case I ever do luck up on one of these deals I would sure like to know how others have manhandled a Bridgeport into their garage. Seriously, where is everyone finding these $500 Bridgeports and how are they moving them to their home shops?

[Lowfategg]

Originally Posted by DeepWater

I'm assuming you are referring to a typical residential two car garage here?



Ok, I have heard similar stories from countless others over the years and I know they exist out there but I have just never been able to luck up on one of these $500 Bridgeport mill deals to save my life. I have been looking high and low for years but we just don't live in an area with a lot of manufacturing so these deals just don't seem to happen around here.

How does one get and move something like this to a home garage? I don't know of many homes with a forklift so just in case I ever do luck up on one of these deals I would sure like to know how others have manhandled a Bridgeport into their garage. Seriously, where is everyone finding these $500 Bridgeports and how are they moving them to their home shops?

Yes its a typical residential 2 car garage (24x24?).

I probably should have been a little more detailed about the price of the Bridgeport. We got the machine (J-head Bridgeport 1964) without the DRO for $500 with a 6" clone Kurt mill vise. I added a $450 2 axis DRO from ebay later, and then an import powerfeed for the X axis for $200. Also, its not entirely necessary for some people, but I did swap the 1 HP 3 phase motor for a 1.5 hp 1 phase motor, since we don't get 3 phase power where I live.

To move the machine we rented a moving truck with a power tailgate. The people we bought the machine from loaded the machine in with their fork lift. Once we got home, we moved the machine onto the power tail gate using a pry bar and steel pipes placed under the base of the machine so it could roll. Once on the ground you can just keep up the same action of using the steel pipes to roll it where ever you like. Its not easy work, but it is doable.

Finding these machines all depends on where you live. Like here in New Jersey there is another $500 BP selling on craigslist.

So in total its more like $1500 after add-ons and rental charges for us, but that is still far less than any similarly sized and equipped benchtop mill (thousands less than a new knee mill, Bridgeports (2J) new are around 12k).

[ChuckDickerson]

Originally Posted by Lowfategg

Once we got home, we moved the machine onto the power tail gate using a pry bar and steel pipes placed under the base of the machine so it could roll. Once on the ground you can just keep up the same action of using the steel pipes to roll it where ever you like. Its not easy work, but it is doable.

Assuming there are no hills involved. I have this mental image of a Bridgeport rolling down my driveway and into my truck stuck in my head right now.

BTW: In the same spirit of all the "How many people does it take to screw in a light bulb joke": How many people does it take to roll a Bridgeport around on steel pipes?

And by "doable" are we talking "completely safe but a lot of work" sort of "doable" or more like "you either can now never move and will die in that house because you are NEVER moving that thing again or whoever buys the house after you gets the mill too" sort of "doable"?

Thanks for the info though. I keep checking Craigslist all around my area but no "great deals" have popped up here in years!

[Lowfategg]

Originally Posted by DeepWater

Assuming there are no hills involved. I have this mental image of a Bridgeport rolling down my driveway and into my truck stuck in my head right now.

BTW: In the same spirit of all the "How many people does it take to screw in a light bulb joke": How many people does it take to roll a Bridgeport around on steel pipes?

And by "doable" are we talking "completely safe but a lot of work" sort of "doable" or more like "you either can now never move and will die in that house because you are NEVER moving that thing again or whoever buys the house after you gets the mill too" sort of "doable"?

Thanks for the info though. I keep checking Craigslist all around my area but no "great deals" have popped up here in years!

Here are two websites that describe what is involved in moving one of these monsters.

http://reference.toolandfab.com/writ...move/index.htm

http://www.garahan.com/wrljet/bridgeport/

[Dick Linn]

You may find a Bridgeport for $500., but finding one in good condition at that price is difficult.

Now here's a reconditioned B'Port for $2,900.

http://www.practicalmachinist.com/vb...d.php?t=184186

Edit: Hey, I've had some on-line chats with the guy in the first moving link above (Scott - MXtras).

Here's how a few skinny guys offloaded our mill, which weighs around 2,100 pounds.

[Lowfategg]

Originally Posted by Dick Linn

You may find a Bridgeport for $500., but finding one in good condition at that price is difficult.

Now here's a reconditioned B'Port for $2,900.

http://www.practicalmachinist.com/vb...d.php?t=184186

True, but we are building robots, not parts for the space shuttle. A sightly worn out Bridgeport is still FAR better than any other mill you are going to find for $500 new. Still if you do want a machine that is in great condition there are still deals to be found.

By the way that is a great looking one, I saw that on practicalmachinist as well. Look at the scraping on those ways! Beautiful.

[Dick Linn]

If you can find one of the smaller Clausing or Steinel mills or something similar, they would be ideal.