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Thread: Lotze Power Hacksaw - Clean up
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8th March 2015, 07:55 AM #76Philomath in training
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Not necessarily - a power hacksaw would be considered a slow speed device. Is there any advantage in using oil over grease in that situation? I suspect you would have greater wear with oiled bushes because grease on the other hand would tend to stay put. Grease could cope with larger gaps too.
Michael
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8th March 2015 07:55 AM # ADSGoogle Adsense Advertisement
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8th March 2015, 07:58 AM #77SENIOR MEMBER
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Hi Ben,
just sayin', but when I change plain bushes and I dont have access to a press or it is just too difficult fit into one I machine a disc (imagine a thick washer) with the OD slightly smaller than the OD of the bush and a step in the washer slightly smaller than the ID of the bush and drill a hole through the middle. I then make another one to suit a small length (1/4" longer than the bush) of pipe that has a bore slightly larger than the OD of the bush and drill a hole in the middle of that one. The hole is to suit some running thread that I normally have handy. Assemble the set up and tighten the nuts on the running thread then voila! Bush removed.
Reverse the procedure to instal the new ones.
I always machine up my own bushes from cored bushing stock to save on waste. This can be easily got from most bearing suppliers.
Phil
ps I'm not very good at explaining stuff
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8th March 2015, 01:32 PM #78SENIOR MEMBER
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Hi Phil,
I understand what your saying (I think). Sort of making a bearing pusher/puller. I made something similar for my Hercus headstock. One of the blokes at work suggested using a hacksaw to make longitudinal cuts along the bush and then tap out the bush but I'm worried about cutting into the casting. We have a press at work but was also worried about breaking the casting. I like your idea, I don't know why I didn't think about it first!
I wouldn't use grease simply because this hacksaw will be used at home and my two youngest would no doubt find the grease and play with it.
Cheers Ben
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8th March 2015, 11:18 PM #79.
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I can't remember the exact size of the bushes I bought. It was about 8 years ago. They had a larger external diameter and a smaller bore than the originals and I machined them to suit. I replaced the bushes in the fashion described by Phil using my bench vice as a press.
I purchased a length of PG 4140 to replace the bar but didn't because Phillip "Metalman" warned me about the fragility of the bow's casting at the location of the bar socket. Phillip's is cracked.
The reality is I don't use my Lotze. I use a 300 dollar Chinese horizontal bandsaw with a replacement German bi-metal blade. No comparison.
Bob.
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9th March 2015, 04:18 PM #80Novice
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Ebay Lotze
Just jumped on the Lotze bandwagon. Bought the one on ebay. $77 sight unseen. Here's hoping it's a goodun. No doubt I will have some questions when I get it home. Anyone have an idea of total weight? Will it fit in the boot of the wifes Honda civic hatch? Hahaha
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9th March 2015, 08:50 PM #81SENIOR MEMBER
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I lifted mine by myself onto a trailer. Wouldn't do that again. Two man lift no worries. They have a small footprint.
Didn't do anything today, had a first aid course all day. Also stacked my pushbike at the front gate and now have some soft tissue damage and sprains.
Ben.
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9th March 2015, 08:57 PM #82GOLD MEMBER
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Must of been fate.
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14th March 2015, 08:18 AM #83SENIOR MEMBER
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Morning,
I've put the hacksaw back together for now and took a quick couple of cuts.
I need to adjust the drive engagement, it keeps popping out of drive.
I'm going to make some new bushes and fit them.
The bronze bush(?) on the square bar needs adjustment or replacement. It keeps coming loose.
The vice lock keeps coming loose, so maybe a new bolt or just general grime might hold it.
The hydraulic pot has a leak.
When the saw bottoms out, it sits too close to top casting, need to make a height adjustment somewhere.
The saw seems to be faster now? Not sure if this is a result of years of grime being cleaned off and everythings been freed up.
Missed a few spots with the paint.
I'm away with work again for several months so won't be working on it until the middle of the year. Not sure if I'll leave it at work or bring it home.
Ben
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20th March 2015, 07:49 PM #84Novice
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Got my saw home last week and plugged it in and tried it out as is. The blade is shot and the bronze bushes the the round bar rides in are very sloppy. But it works as it should and after fitting new blade I put in a piece of 3"x1" flat bar and set it to work. Took about twelve minutes to cut through. This is pretty hard steel bar which I have been using to make quick change tool holders for the lathe. I have blunted two milling cutters on it despite being careful with feed rates and coolant etc. so I don’t know whether the cutting rate is slow for one of these machines or not. I will try some 1020 round bar in it and see. Have found a couple of bronze bushes that should fit and have them on order. It is the model with the hydraulic cylinder which seems to be doing nothing at all at the moment so that will need an overhaul. Other than that it looks in fine fettle and I’m looking forward to getting it back to a good working spec. Not a restoration but just back to good mechanical condition.
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22nd May 2015, 06:39 PM #85SENIOR MEMBER
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Copper Bushes?
Hi,
I'm going to replace the bronze bushes in my Lotze Hacksaw. The originals are 90% Copper and 10% Tin, I can't remember the trade name at the moment.
I have enough copper bar (a marine grade I suspect) to make the bushes. I'm not sure if using straight copper will be ok, too soft and not oil impregnated. Before someways says buy some, I want to save money.
Cheers Ben.
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22nd May 2015, 06:41 PM #86
Wouldn't they have been bronze?
…..Live a Quiet Life & Work with your Hands
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15th June 2015, 06:44 PM #87SENIOR MEMBER
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Finally made one copper bush. The two previous attempts failed. I had a hard time measuring the OD and ID for the bush, until I used my trusty inside caliphers.
Not if the end bush will need replacing. I've loctited the front bushing in place and will put it back together and see how it goes.
Ben.
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