LumberJocks

Central Machinery SLOW DOWN

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by woodworm1962 posted 02-20-2018 11:28 AM 768 views 0 times favorited 15 replies Add to Favorites Watch
View woodworm1962's profile

woodworm1962

145 posts in 217 days


02-20-2018 11:28 AM

With my tax refund. MINUS MY OBAMACARE FINES! MY GAWD. I am seriously thinking of buying a Harbor Freight Central machinery LATHE … this one…

I have really never needed a lathe but that is because I have never done any designs with a lathe in mind. BUT I have a sure thing CASH gig if I can make a set of four large diameter wooden footers for some wooden columns. The footers are 24 inch across (DIAMETER). They Would plan on making them out of white pine glued up

So I need a lathe that would have a swing out head stock, this one does. BUT I have watched a lot of vid. on it and every one says the lowest speed setting in way too fast and is at least twice the posted speed. NOT A HARBOR FREIGHT PRODUCT say it aint so.

A couple of vids show guys using a router dimmer switch to slow it down but doesn’t that mean the power is reduced. One guy made some sort of pully system on the reverse side NOT THE HEADSTOCK side to do this but just showed his work not how he did it.

The Speed setting system is exactly like the SHOPSMITH system. Two pullies that grow or shrink using one belt to change the speed. I had a shopsmith a long time ago and loved it. Best lathe I ever had. One guy said he slowed it down a little by using a very narrow BELT….?

ALSO if I had a lathe I would use it on a lot for more stuff once I had one not just this gig.

QUESTIONS…

1) Any experience with using this machine? ADVICE!

2) How would you slow down the low end? ADVICE!

-- No one likes the truth...


15 replies so far

View ChrisK's profile

ChrisK

1984 posts in 3198 days


#1 posted 02-20-2018 11:54 AM

Narrow belt will not make a noticeable change. You might be able to change the pulleys out and get a lower reduction. I do not know if you can swap the locations of the existing pulleys. Look at McMaster-Carr to see what is available in pulleys that will fit the shafts. You will need to see if they are metric or standard or both.

You might be able to get a set of single pulleys that while are not adjustable, they could potentially be cheaper.

600 rpm on a 24” dia is 3770 surface feet per minute, that is fast. Also check the 12” throw over the bed and make sure it is really 12”.

https://www.mcmaster.com/

http://www.martinsprocket.com/

-- Chris K

View woodworm1962's profile

woodworm1962

145 posts in 217 days


#2 posted 02-20-2018 12:10 PM

Well I think you are thinking that the speed system is set up like a Drill Press with a series of pullys. it is not its liek a shopsmith SEE IMAGE… Also I couldnt help but point out the fan …


Narrow belt will not make a noticeable change. You might be able to change the pulleys out and get a lower reduction. I do not know if you can swap the locations of the existing pulleys. Look at McMaster-Carr to see what is available in pulleys that will fit the shafts. You will need to see if they are metric or standard or both.

You might be able to get a set of single pulleys that while are not adjustable, they could potentially be cheaper.

600 rpm on a 24” dia is 3770 surface feet per minute, that is fast. Also check the 12” throw over the bed and make sure it is really 12”.

https://www.mcmaster.com/

http://www.martinsprocket.com/

- ChrisK


-- No one likes the truth...

View Fresch's profile

Fresch

302 posts in 2037 days


#3 posted 02-20-2018 01:41 PM

Get a Shopsmith speed reducer and a Shopsmith off Craigslist turn the power head around(now it’s off the bed) bolt a bearing with a live center in it to the wall, now you can turn 48” stock. Some utubes vids of a guy turning a tree like this.

View RobHannon's profile

RobHannon

145 posts in 647 days


#4 posted 02-20-2018 01:50 PM

I have seen some videos of folks adding an additional detent hole on the mechanism that controls the speed. I have the same lathe but have not needed to slow it down yet as I have done mostly thinner spindle work that I can get away with the higher speed on.

As far as the 12” throw over the bed, on mine is it exactly 12” and no way I would try to turn something that large on it. Not just because of the speed and clearance, the 2 piece banjo for outboard and large turning feels unstable to me. I would not try to turn 24” columns on that lathe. It is a great learning lathe, but I think those columns are pushing past it’s limits. If you got a longer 1 piece banjo like a Powermatic, Robust, Oneway and slowed it down it may be capable, but at that point I would look for a used big lathe that is already equipped for that sort of work.

View Bill White's profile

Bill White

5048 posts in 4077 days


#5 posted 02-20-2018 01:55 PM

and a router speed reducer WILL NOT work on an induction motor….....
Bill

-- bill@magraphics.us

View Albert's profile

Albert

513 posts in 3706 days


#6 posted 02-20-2018 02:02 PM

Put your tax refund into a well diversified mutual fund, in a few years you can buy a good lathe.

View dhazelton's profile

dhazelton

2789 posts in 2413 days


#7 posted 02-20-2018 02:23 PM

I don’t think that machine is heavy enough to handle a 24 inch blank. If you put a sandbag or two on the opposite end perhaps but I think the spindle bearings aren’t meant for that much weight.

If you want to try it I don’t think speed will be a problem if you have a perfectly round blank to start with.

View yvrdennis's profile

yvrdennis

48 posts in 1194 days


#8 posted 02-20-2018 03:39 PM

Turning at the lathe’s existing minimum speed would be crazy unsafe, especially with a laminated blank. If a glue joint comes apart the pieces of the blank will fly apart at speeds that could kill you. There have been fatalities from this sort of thing in the past.

If you slow the speed down by somehow using stepped pulleys then you will increase the headstock torque, and you’re going to need all of the torque you can to turn something that big. You could use a vfd to slow down the motor, but vfd’s work by slowing the motor down and maintaining more or less the same torque at the motor. In other words if you use a vfd to cut a motor’s speed in half you also cut it’s power in half.

If you manage to slow the lathe down to a safe speed you might make this work, but I think you’ll be pulling your hair out trying to turn something this big on a lathe with that little power. There is a reason those of us that turn big stuff spend thousands on a big lathe.

View BobAnderton's profile

BobAnderton

283 posts in 2907 days


#9 posted 02-20-2018 03:46 PM

That machine is the same as the JET 1236, shown here.

I used to have one and it was fine for an inexpensive reeves drive lathe. The spindle is 6” above the bed, so the max diameter you can make over the bed is 12 inches. You can get the tool rest pretty far over in front of the lathe to get to the backside of things using the included banjo extension. Make a wooden shelf to put down in the stretchers and put some weight on it. It will serve you fine until you decide to let loose and buy a really expensive lathe. I second the view that 24” diameter is pretty large for the 600 rpm min speed. Make sure it’s well balanced and held well before you turn it on, and be ready to turn it back off quick. Stay out of the line of fire.

The 3/4 HP motor will have trouble if you’re cutting very hard on a 24” diam blank. Consider if you could achieve what you need to on that project with a circle jig on a router and various bits, going around a center pivot pin. 24” is big.

-- Bob Anderton - Austin, TX - Nova 3000 lathe, Alaskan Mark III mill, Husqavarna Saw

View Ripper70's profile

Ripper70

1113 posts in 1025 days


#10 posted 02-20-2018 03:52 PM

I’ve seen modifications to the HF lathe using a treadmill motor that can have full variable speed control. Might be worth considering if you’re willing to spend the time rather than the money. Treadmill motors can be had practically for free. Check craigslist.

-- "You know, I'm such a great driver, it's incomprehensible that they took my license away." --Vince Ricardo

View JollyGreen67's profile

JollyGreen67

1676 posts in 2880 days


#11 posted 02-20-2018 04:23 PM

How much is this “thing” going to cost what with all the funky changes that would have to be made to do what you want to do ? Take your refund and buy a REAL lathe – not a Rube Goldberg invention.

-- When I was a kid I wanted to be older . . . . . this CRAP is not what I expected ! RIP 09/08/2018

View woodworm1962's profile

woodworm1962

145 posts in 217 days


#12 posted 02-20-2018 06:19 PM

Well I might not pass on the lathe but looks like I am a bit ambitious about the 24 inch column footers.

I have grown attached to my digits and wish to keep them.

Sounds if I wanted to really do this best thing to do would be build some sort of contraption to turn it.

-- No one likes the truth...

View woodworm1962's profile

woodworm1962

145 posts in 217 days


#13 posted 02-20-2018 06:20 PM

The pic is of a JET I just couldnt find a good clear one of the CM one


That machine is the same as the JET 1236, shown here.

I used to have one and it was fine for an inexpensive reeves drive lathe. The spindle is 6” above the bed, so the max diameter you can make over the bed is 12 inches. You can get the tool rest pretty far over in front of the lathe to get to the backside of things using the included banjo extension. Make a wooden shelf to put down in the stretchers and put some weight on it. It will serve you fine until you decide to let loose and buy a really expensive lathe. I second the view that 24” diameter is pretty large for the 600 rpm min speed. Make sure it s well balanced and held well before you turn it on, and be ready to turn it back off quick. Stay out of the line of fire.

The 3/4 HP motor will have trouble if you re cutting very hard on a 24” diam blank. Consider if you could achieve what you need to on that project with a circle jig on a router and various bits, going around a center pivot pin. 24” is big.

- BobAnderton


-- No one likes the truth...

View dhazelton's profile

dhazelton

2789 posts in 2413 days


#14 posted 02-21-2018 10:48 PM

Put your car on jackstands and use a wheel as a lathe. It’s been done. Is it safe? I dunno but it’s been done.

View ppg677's profile

ppg677

192 posts in 973 days


#15 posted 02-22-2018 12:18 AM


With my tax refund. MINUS MY OBAMACARE FINES! MY GAWD. I am seriously thinking of buying a Harbor Freight Central machinery LATHE … this one…

I’m curious, what are the fines for not having healthcare? A small fraction of enrolling in ACA?

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com