Re: Mill/Drill

I have seen several Jet Mill drills at a local tool supplier. They had
exactly the same problems except the quill backlash was even worse.
I replaced the acme screws in my Enco mill with ballscrews. Now it is very
accurate .0005 with little zero backlash.
Dan.

-----Original Message-----
From: Leighton M. Reed-Nickerson <w2hie@...>
To: CAD_CAM_EDM_DRO@onelist.com <CAD_CAM_EDM_DRO@onelist.com>
Date: Tuesday, June 22, 1999 10:38 AM
Subject: Re: [CAD_CAM_EDM_DRO] Mill/Drill

>From: "Leighton M. Reed-Nickerson" <w2hie@...>
>
>I'm not sure I would agree "all" Asian machines are of poor quality. Jet
>and Acra seem to be quite good. You have to strike a balance, a worn out
>Bridgeport vs. a new Taiwanese machine. Both are going to require some work
>to make them CNC suitable. Both may cost about the same.
>
>Some folks say avoid Harbor Freight, as they reportedly have poor quality
>Asian machines.
>
>I guess you could qualify it this way (this is a generalization, and may

not

>always hold) , Taiwanese machines are better than Chinese, Chinese are
>better than Indian.
>
>I bought a reconditioned Bridgeport about 5 years ago, It still had a lot

of

>backlash so I opted to spend about $1,000 for ballscrews. I still had

about

>.003 backlash, until I loaded the bearings. Now I have a very tight

machine.

>
>Some of the detail work on the Asian machines needs help, an article in

Home

>Shop Machinist addressed some of that. (New hand wheels, replacing the gib
>locks, etc).
>
>It seems we all like Bridgeports and Bridgeport clones, but if I had it to
>do over again, I probably would have saved my money and looked for a used
>Cincinnati, for a manual mill, I expect CNC conversion of a Cincinnati

would

>be a major undertaking.
>
>Linc
>
>Leighton M. (Linc) Reed-Nickerson
>Broadcast Technology US
>Phone: 360-834-1862
>Fax: 360-834-6061
>Web www.broadcasttechnology.com
>
>
>-----Original Message-----
>From: TADGUNINC@... [mailto:TADGUNINC@...]
>Sent: Tuesday, June 22, 1999 06:48 AM
>To: CAD_CAM_EDM_DRO@onelist.com
>Subject: Re: [CAD_CAM_EDM_DRO] Mill/Drill
>
>From: TADGUNINC@...
>
>>From: "Kevin Brennan" <k.brennan@...>
>>
>>I've been lurking and reading and I'm interested in this whole scene, I'm
>>looking at mill/drills and Harbor Freight has a 8x28" with 19". of long
>>travel for $899 through tomorrow.
>
>From: "Dan Mauch" <dmauch@...>
>
>All of the imported Asian machines suffer from poor quality.
>
>
>Come on now Dan be nice :o).
> You did not mention one other thing you really ought to upgrade if you
>want to get precision results out of the import machines. The spindle
>bearings should be replaced with high quality ones and preloaded properly.
> I have a "quality import" 8X30 knee mill which I have upgraded. It's

the

>machine I'm going to convert to CNC, as of right now with the DRO I can

hold

>tolerance on my parts to .0005".
> Good advise on upgrading the cheaper mills Dan, have fun Kevin!
>Tracey
>
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